Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies (Details Textual)

v3.8.0.1
Commitments and Contingencies (Details Textual)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 15, 2016
Nov. 30, 2017
USD ($)
Oct. 27, 2017
USD ($)
a
Dec. 31, 2017
USD ($)
shares
Loss Contingencies [Line Items]        
Number Of Shares To Be Issued Upon Legal Settlement | shares       200,000
Litigation Settlement, Expense   $ 0.2    
Litigation Settlement, Amount Awarded to Other Party       $ 2.0
Operating Leases, Rent Expense, Sublease Rentals     $ 0.6  
Operating Leases, Rent Expense, Net     3.6  
Land Improvements     $ 3.5  
Land Subject to Ground Leases | a     27,043  
Security Deposit     $ 0.8  
Increase (Decrease) in Security Deposits     1.3  
Letter of Credit [Member]        
Loss Contingencies [Line Items]        
Security Deposit     0.5  
Increase (Decrease) in Security Deposits     1.0  
Cash [Member]        
Loss Contingencies [Line Items]        
Security Deposit     0.3  
Increase (Decrease) in Security Deposits     $ 0.3  
City Of Hope [Member]        
Loss Contingencies [Line Items]        
Failed Contingency Damages Awarded Percentage 15.00%