UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated other comprehensive income (loss )	Accumulated Deficit	Total
Beginning balance at Dec. 31, 2020	$ 1	$ 585,374		$ (488,195)	$ 97,180
Beginning balance, shares at Dec. 31, 2020	56,890,569
Net income				21,503	21,503
Exercise of stock options		660			660
Exercise of stock options, Shares	109,570
Stock-based compensation		7,208			7,208
Ending balance at Jun. 30, 2021	$ 1	593,242		(466,692)	126,551
Ending balance, shares at Jun. 30, 2021	57,000,139
Beginning balance at Mar. 31, 2021	$ 1	588,687		(480,809)	107,879
Beginning balance, shares at Mar. 31, 2021	56,892,406
Net income				14,117	14,117
Exercise of stock options		648			648
Exercise of stock options, Shares	107,733
Stock-based compensation		3,907			3,907
Ending balance at Jun. 30, 2021	$ 1	593,242		(466,692)	126,551
Ending balance, shares at Jun. 30, 2021	57,000,139
Beginning balance at Dec. 31, 2021	$ 1	640,104		(453,598)	186,507
Beginning balance, shares at Dec. 31, 2021	58,825,769
Net income				45,016	45,016
Unrealized loss on investments			$ (29)		(29)
Exercise of stock options		3,133			$ 3,133
Exercise of stock options, Shares	291,980				278,305
Stock-based compensation		11,906			$ 11,906
Ending balance at Jun. 30, 2022	$ 1	655,143	(29)	(408,582)	246,533
Ending balance, shares at Jun. 30, 2022	59,117,749
Beginning balance at Mar. 31, 2022	$ 1	646,615		(432,113)	214,503
Beginning balance, shares at Mar. 31, 2022	59,030,148
Net income				23,531	23,531
Unrealized loss on investments			(29)		(29)
Exercise of stock options		1,250			1,250
Exercise of stock options, Shares	87,601
Stock-based compensation		7,278			7,278
Ending balance at Jun. 30, 2022	$ 1	$ 655,143	$ (29)	$ (408,582)	$ 246,533
Ending balance, shares at Jun. 30, 2022	59,117,749