Condensed Consolidated Statements of Stockholders’ Equity (Unaudited)​ - USD ($) $ in Thousands	Total	Common	Treasury	Additional Paid-In Capital	Accumulated Other Comprehensive Income	Accumulated Deficit
Increase (Decrease) in Stockholders' Equity
Beginning balance (in shares)		48,819,591	0
Beginning balance at Dec. 31, 2020	$ 557,058	$ 5	$ 0	$ 675,615	$ 41	$ (118,603)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	7,055			7,055
Issuance of restricted stock award (in shares)		145,535
Exercise of stock options (in shares)		59,026
Exercise of stock options	359			359
Other comprehensive income (loss), net of tax	12				12
Net loss	(29,787)					(29,787)
Ending balance (in shares) at Mar. 31, 2021		49,024,152	0
Ending balance at Mar. 31, 2021	534,697	$ 5	$ 0	683,029	53	(148,390)
Increase (Decrease) in Stockholders' Equity
Beginning balance (in shares)		49,024,152	0
Beginning balance (in shares)		49,247,985	0
Beginning balance at Dec. 31, 2021	422,396	$ 5	$ 0	715,216	(312)	(292,513)
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense	17,094			17,094
Issuance of restricted stock award (in shares)		36,625
Forfeiture of restricted stock awards (in shares)		(3,440)
Exercise of stock options (in shares)		142,657
Exercise of stock options	1,167			1,167
Shares of common stock used to satisfy tax withholding obligations (in shares)			16,210
Shares of common stock used to satisfy tax withholding obligations	(906)		$ (906)
Other comprehensive income (loss), net of tax	(1,146)				(1,146)
Net loss	(61,801)					(61,801)
Ending balance (in shares) at Mar. 31, 2022		49,423,827	16,210
Ending balance at Mar. 31, 2022	$ 376,804	$ 5	$ (906)	$ 733,477	$ (1,458)	$ (354,314)
Increase (Decrease) in Stockholders' Equity
Beginning balance (in shares)		49,423,827	16,210