Changes to Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]	Total
Balances (in shares) at Dec. 31, 2020	40,732				14
Balances at Dec. 31, 2020	$ 41	$ 600,388	$ (205,924)	$ (80)	$ (256)	$ 394,169
Exercise of options to purchase common stock (in shares)	72
Exercise of options to purchase common stock	$ 0	714				714
Vesting of restricted stock units (in shares)	23				0
Vesting of restricted stock units	$ 0	(1,529)	0	0	$ 0	(1,529)
Share-based compensation expense		6,151				6,151
Foreign Currency Translation				259		259
Net loss			(10,888)			(10,888)
Shares issued in primary offering (in shares)	2,415				0
Shares issued in primary offering	$ 2	332,518	0	0	$ 0	332,520
Balances (in shares) at Mar. 31, 2021	43,242				14
Balances at Mar. 31, 2021	$ 43	938,242	(216,812)	179	$ (256)	721,396
Balances (in shares) at Dec. 31, 2021	43,449				14
Balances at Dec. 31, 2021	$ 43	955,710	(235,623)	(120)	$ (256)	719,754
Exercise of options to purchase common stock (in shares)	22
Exercise of options to purchase common stock	$ 0	232				232
Vesting of restricted stock units (in shares)	14				0
Vesting of restricted stock units	$ 0	(323)	0	0	$ 0	(323)
Share-based compensation expense		6,295				6,295
Foreign Currency Translation				(362)		(362)
Net loss			(17,542)			(17,542)
Balances (in shares) at Mar. 31, 2022	43,485				14
Balances at Mar. 31, 2022	$ 43	$ 961,914	$ (253,165)	$ (482)	$ (256)	$ 708,054