CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Convertible Preferred Stock	Redeemable Common Stock
Beginning balance (in shares) at Dec. 31, 2019							33,443,969	5,901,863
Beginning balance at Dec. 31, 2019							$ 61,216	$ 19,025
Ending balance (in shares) at Mar. 31, 2020							33,443,969	5,901,863
Ending balance at Mar. 31, 2020							$ 61,216	$ 19,025
Beginning balance (in shares) at Dec. 31, 2019		5,746,216
Beginning balance at Dec. 31, 2019	$ 13,295	$ 1	$ (11,431)	$ 8,641	$ 6	$ 16,078
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	503			503
Exercise of stock options (in shares)		58,452
Exercise of stock options	74			74
Other comprehensive income (loss)	20				20
Net income	904					904
Ending balance (in shares) at Mar. 31, 2020		5,804,668
Ending balance at Mar. 31, 2020	14,796	$ 1	(11,431)	9,218	26	16,982
Beginning balance (in shares) at Dec. 31, 2020							0	0
Beginning balance at Dec. 31, 2020							$ 0	$ 0
Ending balance (in shares) at Mar. 31, 2021							0	0
Ending balance at Mar. 31, 2021							$ 0	$ 0
Beginning balance (in shares) at Dec. 31, 2020		48,988,142
Beginning balance at Dec. 31, 2020	175,427	$ 6	(11,434)	144,163	1	42,691
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	$ 3,318			3,318
Exercise of stock options (in shares)	278,412	278,412
Exercise of stock options	$ 451			451
Repurchase of treasury stock, at cost (in shares)		(693)
Repurchase of treasury stock, at cost	(27)		(27)
Other comprehensive income (loss)	(1)				(1)
Net income	4,918					4,918
Ending balance (in shares) at Mar. 31, 2021		49,265,861
Ending balance at Mar. 31, 2021	$ 184,086	$ 6	$ (11,461)	$ 147,932	$ 0	$ 47,609