Statements of Changes in Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid in Capital	Accumulated Deficit	Other Comprehensive Income	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 exercises, net of shares withheld			31			31
Stock option exercises, net of shares withheld (in shares)	32,067
Stock-based compensation			1,529			1,529
Net income				4,041		4,041
Balance at end of period at Jun. 30, 2019	$ 1	(884)	12,182	(100,813)		(89,514)
Balance at end of period (in shares) at Jun. 30, 2019	5,187,474
Balance at beginning of period at Mar. 31, 2019	$ 1	(884)	11,141	(102,333)		(92,075)
Balance at beginning of period (in shares) at Mar. 31, 2019	5,157,211
Increase (Decrease) in Stockholders’ Equity
Stock option exercises, net of shares withheld			29			29
Stock option exercises, net of shares withheld (in shares)	30,263
Stock-based compensation			1,012			1,012
Net income				1,520		1,520
Balance at end of period at Jun. 30, 2019	$ 1	(884)	12,182	(100,813)		(89,514)
Balance at end of period (in shares) at Jun. 30, 2019	5,187,474
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 exercises, net of shares withheld	$ 1		(2,668)			$ (2,667)
Stock option exercises, net of shares withheld (in shares)	1,589,855
Stock-based compensation			5,590			5,590
Reduction in initial public offering costs			115			115
Other comprehensive income					$ 5	5
Net income				2,245		2,245
Balance at end of period at Jun. 30, 2020	$ 9	(1,009)	231,792	(111,238)	5	$ 119,559
Balance at end of period (in shares) at Jun. 30, 2020	85,778,057					84,845,828
Balance at beginning of period at Mar. 31, 2020	$ 8	(1,009)	231,516	(109,426)		$ 121,089
Balance at beginning of period (in shares) at Mar. 31, 2020	84,845,828
Increase (Decrease) in Stockholders’ Equity
Stock option exercises, net of shares withheld	$ 1		(3,265)			(3,264)
Stock option exercises, net of shares withheld (in shares)	932,229
Stock-based compensation			3,541			3,541
Other comprehensive income					5	5
Net income				(1,812)		(1,812)
Balance at end of period at Jun. 30, 2020	$ 9	$ (1,009)	$ 231,792	$ (111,238)	$ 5	$ 119,559
Balance at end of period (in shares) at Jun. 30, 2020	85,778,057					84,845,828