Stockholders' Equity (Details Textual)

v3.8.0.1

Stockholders' Equity (Details Textual) - USD ($)							1 Months Ended												10 Months Ended		12 Months Ended
	Aug. 03, 2017	Jun. 08, 2017	Apr. 07, 2017	Mar. 13, 2017	Dec. 12, 2016	Mar. 13, 2016	Apr. 24, 2017	Mar. 31, 2017	Feb. 28, 2017	Jan. 31, 2017	Dec. 29, 2016	Nov. 30, 2016	Oct. 31, 2016	Oct. 25, 2016	Sep. 30, 2016	Jul. 31, 2016	Jul. 27, 2016	Mar. 17, 2015	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Mar. 13, 2018	Mar. 12, 2018	Aug. 31, 2017	Jul. 26, 2016	Apr. 30, 2015	Mar. 12, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares, Issued																					25,236,255	15,165,244
Common Stock, Shares Authorized																					50,000,000	50,000,000
Common Stock, Par or Stated Value Per Share																					$ 0.0001	$ 0.0001
Common Stock, Voting Rights																					1.1
Warrants Issued								16,000		2,134,193
Proceeds from Issuance or Sale of Equity																				$ 0	$ 50,296,000	$ 35,008,000
Payments for Underwriting Expense																						$ 1,400,000
Common Stock, Shares Subscribed but Unissued																					834,756	767,264
Common Stock, Value, Subscriptions																					$ 9,558,000	$ 4,396,000
Shares, Outstanding
Class Of Warrant Or Right, Warrants Issued																						138,462
Stock Issued During Period, Value, New Issues																					55,970,000	$ 39,098,000
Payments of Stock Issuance Costs																				0	$ 5,674,000	$ 4,090,000
Preferred Stock, Shares Authorized																					2,000,000	2,000,000				2,000,000
Stock Issued During Period, Value, Issued for Services									$ 1,700,000
Proceeds from Issuance of Private Placement													$ 10,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights																					The remaining 50% (the Performance Options) vest and become exercisable upon the occurrence of the following milestones being achieved: (i) 25% of the Performance Options vest upon the dosing of the first patient in the first Phase 2 clinical trial of any Company product candidate, (ii) 25% of the Performance Options vest upon the dosing of the first patient in the first Phase 2 clinical trial of a second Company product candidate, (iii) 25% of the Performance Options vest upon the Companys achievement of a fully-diluted market capitalization of $500,000,000 and (iv) 25% of the Performance Options vest upon the Companys achievement of a fully-diluted market capitalization of $1,000,000,000.
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value																					$ 5.73
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate																					0.00%
Class Of Warrant Or Right, Percentage Of Warrant Issued																					25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price																					$ 5.73
Research and Development Asset Acquired Other than Through Business Combination, Fair Value Acquired																					$ 9,600,000
Share-based Compensation																			$ 0	$ 0	2,012,000	$ 0
Research and Development Expense																					$ 100,000
Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Issued, Price Per Share																								$ 11.45
Incentive Plan 2016 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized																					2,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period																					10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant																					444,325
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense																					$ 10,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense																					$ 900,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																					180,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term																					3 years 3 months 11 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value																					$ 5.73
Restricted Stock [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		180,000																			10,000
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense																					$ 500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																					134,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term																					2 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value																					$ 6.53
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchased During Period, Shares							1,041,675
Allocated Share-based Compensation Expense																					$ 1,900,000
Shares Issued, Price Per Share			$ 5.73				$ 5.73
Stock Issued During Period, Shares, Issued for Services			200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term																					1 year 5 months 5 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value																					$ 10.98
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeiture Rate																						0.00%
Capital Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Of Placement Agent Fee					10.00%						10.00%	10.00%		10.00%
Stock Issued During Period, Shares, New Issues					477,000						632,246	1,900,215		1,090,580
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 8.50						$ 8.50	$ 8.50		$ 8.50
Shares Issued, Price Per Share					$ 65,000						$ 65,000	$ 65,000		$ 65,000
Class Of Warrant Or Right, Warrants Term					five-year term						five-year term	five-year term		five-year term
Class Of Warrant Or Right, Warrants Issued					119,250						158,062	475,053		272,645
Stock Issued During Period, Value, New Issues					$ 3,100,000						$ 4,100,000	$ 12,400,000
Payments of Stock Issuance Costs					$ 310,000						$ 410,000	$ 1,200,000		$ 109,058
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right					2,500						2,500	2,500		2,500
Warrant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues															478,708
Warrant [Member] | Capital Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues														10,000
General and Administrative Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense																					$ 1,200,000	$ 862,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues															1,914,833		7,000,000
Common Stock [Member] | Capital Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues					10,000						10,000	10,000
Unregistered Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues								64,000		8,536,774
Series A Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Issued																					250,000	250,000
Stock Issued During Period, Shares, New Issues																	250,000				0	0
Shares, Outstanding																			0	0	250,000	250,000
Stock Issued During Period, Value, New Issues																					$ 0	$ 0
Stock Issued During Period, Shares, Issued for Services																					0	0
Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Authorized																15,000,000
Stock Issued During Period, Shares, New Issues																					0	0
Shares, Outstanding																			7,000,000	7,000,000	0	0
Stock Repurchased and Retired During Period, Shares																	7,200,000
Stock Issued During Period, Value, New Issues																					$ 0	$ 0
Stock Issued During Period, Shares, Issued for Services																					0	250,000
Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares, Issued																					1,000,000	1,000,000
Common Stock, Shares Authorized																1,000,000						1,000,000
Stock Issued During Period, Shares, New Issues																					0	0
Shares, Outstanding																			1,000,000	1,000,000	1,000,000	1,000,000
Stock Issued During Period, Value, New Issues																					$ 0	$ 0
Stock Issued During Period, Shares, Issued for Services																					0	0
Preferred Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred Stock, Shares Issued																										250,000
Fortress Biotech, Inc [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares, Issued																									365,639
Shares Of Common Stock, Percentage																						2.50%
Common Stock, Value, Subscriptions																						$ 900
Shares Issued, Price Per Share				$ 5.73
Stock Issued During Period, Shares, Issued for Services				767,264
Stock Issued During Period, Value, Issued for Services				$ 4,400,000
Research and Development Asset Acquired Other than Through Business Combination, Fair Value Acquired																				$ 200,000	$ 9,600,000	$ 4,400,000
Percentage of issued shares in diluted outstanding shares																									2.50%
Fortress Biotech, Inc [Member] | Subsequent Event [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Of Common Stock, Percentage																								2.50%
Percentage of issued shares in diluted outstanding shares																							2.50%
Common Stock, Capital Shares Reserved for Future Issuance																							834,756
Fortress Biotech, Inc [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares Of Common Stock, Percentage																					2.50%
Stock Issued During Period, Shares, New Issues																					982,533	150,370
Common Stock, Shares Subscribed but Unissued																						2,000,000
Shares Issued, Price Per Share																					$ 11.45
Research and Development Expense																					$ 9,600,000
Fortress Biotech, Inc [Member] | Series A Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Issued for Services																250,000
Fortress Biotech, Inc [Member] | Common Class B [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares, Issued						250,000
Common Stock, Shares Subscribed but Unissued																						7,000,000
Diluted Outstanding Equity, Percentage						2.50%
Fortress Biotech, Inc [Member] | Common Stock B One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares, Issued						250,000
Percentage of issued shares in diluted outstanding shares						2.50%
Research and Development Expense																			$ 37,000
Fortress Biotech, Inc [Member] | Common Stock B Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares, Issued				767,264
Percentage of issued shares in diluted outstanding shares				2.50%
Research and Development Expense																						$ 4,400,000
National Holdings Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants Issued	2,500
National Holdings Corporation [Member] | Unregistered Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues	10,000
City of Hope National Medical Center [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues									293,588
City of Hope National Medical Center [Member] | Original Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payment Of Upfront Fees																		$ 2,000,000
City of Hope National Medical Center [Member] | Common Stock [Member] | Original Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued																					293,588
City of Hope National Medical Center [Member] | Common Class A [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares, Issued																					1,000,000
City of Hope National Medical Center [Member] | Common Class A [Member] | Original Agreement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners																											10.00%
Shares, Outstanding																											1,000,000
National Securities, Inc [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Of Placement Agent Fee															10.00%
Percentage Of Shares Issued To Placement Agent	10.00%														10.00%
Warrants Issued	1,000							6,400		853,677
National Securities, Inc [Member] | Capital Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments of Stock Issuance Costs														$ 710,000
Private Placement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Of Shares Issued To Placement Agent					10.00%						10.00%	10.00%		10.00%
Warrant Purchase Price Per Unit															$ 65,000
Warrants Issued					47,700						63,224	190,021			191,483
Stock Issued During Period, Shares, New Issues															10,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights															2,500
Class of Warrant or Right, Exercise Price of Warrants or Rights															$ 8.50						$ 8.50	$ 8.50
Proceeds from Issuance or Sale of Equity																						$ 12,400,000
Payments for Underwriting Expense																						$ 1,300,000
Private Placement [Member] | Capital Unit [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Value, New Issues														$ 7,100,000
Private Placement [Member] | National Holdings Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage Of Placement Agent Fee								10.00%		10.00%
Percentage Of Shares Issued To Placement Agent								10.00%		10.00%
Payments of Stock Issuance Costs								$ 42,000		$ 5,500,000
Proceeds from Issuance of Private Placement	$ 65,000							$ 400,000		$ 55,500,000