Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business Operations (Details Textual)

v3.19.2
Organization and Description of Business Operations (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 30, 2019
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Retained Earnings (Accumulated Deficit)   $ (106,079) $ (106,079) $ (95,397)
Common Stock [Member]        
Shares Issued, Price Per Share $ 3.06 $ 4.12 $ 4.12  
Stock Issued During Period Shares Common Shares For At The Market Offering 1,001,485 997,957 1,088,226  
Stock Issued During Period Value Common Shares For At The Market Offering Gross $ 3,100   $ 4,500  
Stock Issued During Period Value Common Shares For At The Market Offering Net     $ 4,400