Net Income (Loss) Per Common Share (Details Textual) - Class A Common Stock - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Income (Loss) Per Common Share (Textual)
Excluded shares of issued common stock subject to vesting	100	4,410	100	4,410
Shares of common stock issuable upon conversion of warrants	4,900	18,100	2,600	18,100
Common stock issuable upon conversion		1,300		1,300