Statements of Changes in Stockholders' Deficit - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid in Capital	Accumulated Deficit	Total
Balance at beginning of period at Dec. 31, 2018	$ 1	$ (884)	$ 10,622	$ (104,854)	$ (95,115)
Balance at beginning of period (in shares) at Dec. 31, 2018	5,155,407
Increase (Decrease) in Stockholders’ Equity
Stock option exercise			2		2
Options exercised (in shares)	1,804
Stock-based compensation			517		517
Net income				2,521	2,521
Balance at end of period at Mar. 31, 2019	$ 1	(884)	11,141	(102,333)	(92,075)
Balance at end of period (in shares) at Mar. 31, 2019	5,157,211
Balance at beginning of period at Dec. 31, 2019	$ 8	(1,009)	228,755	(113,483)	$ 114,271
Balance at beginning of period (in shares) at Dec. 31, 2019	84,188,202				84,188,202
Increase (Decrease) in Stockholders’ Equity
Stock option exercise			597		$ 597
Options exercised (in shares)	657,626
Stock-based compensation			2,049		2,049
Reduction in initial public offering costs			115		115
Net income				4,057	4,057
Balance at end of period at Mar. 31, 2020	$ 8	$ (1,009)	$ 231,516	$ (109,426)	$ 121,089
Balance at end of period (in shares) at Mar. 31, 2020	84,845,828				84,845,828