Quarterly report pursuant to Section 13 or 15(d)

Organization, Description of Business and Liquidity and Capital Resources (Details)

v3.19.2
Organization, Description of Business and Liquidity and Capital Resources (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Subsidiary, Sale of Stock [Line Items]      
Retained Earnings (Accumulated Deficit) $ (99,082) $ (99,082) $ (79,070)
Common Stock, Shares, Issued 39,454,316 39,454,316 26,610,183
Proceeds From Issuance of Common Shares, At-the-Market Offering   $ 22,515  
Market Issuance      
Subsidiary, Sale of Stock [Line Items]      
Common Stock, Shares, Issued 3,500,000 3,500,000  
Stock Issued During Period Shares , At The Market Offering 22,000,000 22,000,000  
Proceeds From Issuance of Common Shares, At-the-Market Offering $ 22,500 $ 22,500  
Sale of Stock, Price Per Share $ 6.42 $ 6.42  
Public Offering      
Subsidiary, Sale of Stock [Line Items]      
Common Stock, Shares, Issued 7,900,000 7,900,000  
Stock Issued During Period Shares , At The Market Offering 29,500,000 29,500,000  
Proceeds From Issuance of Common Shares, At-the-Market Offering $ 31,600 $ 31,600  
Sale of Stock, Price Per Share $ 4.00 $ 4.00