Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business Operations - Additional Information (Details)

v3.19.3
Organization and Description of Business Operations - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Retained Earnings (Accumulated Deficit) $ (111,285)   $ (111,285)   $ (95,397)
Common Stock [Member]          
Shares Issued, Price Per Share $ 3.54   $ 3.54    
Stock Issued During Period Shares Common Shares For At The Market Offering 1,142,298 1,841,774 2,230,524 1,841,774  
Stock Issued During Period Value Common Shares For At The Market Offering Gross     $ 7,900    
Stock Issued During Period Value Common Shares For At The Market Offering Net     $ 7,700