Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Beginning balance (in shares) at Dec. 31, 2020		166,836
Beginning balance at Dec. 31, 2020	$ 119,115	$ 1,668	$ 340,756	$ (222,626)	$ (683)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under equity compensation plan, net of shares withheld for taxes (in shares)		417
Common stock issued under equity compensation plan, net of shares withheld for taxes	(1,619)	$ 4	(1,623)
Exercise of options (in shares)		1,545
Exercise of options	3,341	$ 16	3,325
Stock-based compensation	1,605		1,605
Net income (loss)	3,793			3,793
Other comprehensive income (loss)	(10)				(10)
Ending balance (in shares) at Mar. 31, 2021		168,798
Ending balance at Mar. 31, 2021	126,225	$ 1,688	344,063	(218,833)	(693)
Beginning balance (in shares) at Dec. 31, 2021		170,072
Beginning balance at Dec. 31, 2021	175,758	$ 1,701	351,079	(176,337)	(685)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under equity compensation plan, net of shares withheld for taxes (in shares)		165
Common stock issued under equity compensation plan, net of shares withheld for taxes	(521)	$ 2	(523)
Exercise of options (in shares)		343
Exercise of options	913	$ 3	910
Stock-based compensation	1,940		1,940
Net income (loss)	(2,321)			(2,321)
Other comprehensive income (loss)	(1)				(1)
Ending balance (in shares) at Mar. 31, 2022		170,580
Ending balance at Mar. 31, 2022	$ 175,768	$ 1,706	$ 353,406	$ (178,658)	$ (686)