Consolidated Statements of Changes In Stockholders' Equity - 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, 2018	35,557				14
Balances at Dec. 31, 2018	$ 35	$ 323,080	$ (201,353)	$ (32)	$ (256)	$ 121,474
Exercise of options to purchase common stock (in shares)	514
Exercise of options to purchase common stock	$ 1	4,460				4,460
Issuance of restricted stock units (in shares)	92
Issuance of restricted stock units		(1,295)				(1,295)
Share-based compensation expense		8,055				8,055
Foreign Currency Translation				(47)		(48)
Net (loss)			(1,383)			(1,383)
Balances (in shares) at Dec. 31, 2019	36,162				14
Balances at Dec. 31, 2019	$ 36	334,299	(202,735)	(79)	$ (256)	131,265
Exercise of options to purchase common stock (in shares)	479
Exercise of options to purchase common stock		5,441				5,441
Issuance of restricted stock units (in shares)	91
Issuance of restricted stock units	$ 0	(2,568)				(2,568)
Share-based compensation expense		11,157				11,157
Foreign Currency Translation				(1)		(1)
Net (loss)			(3,188)			(3,188)
Shares issued in primary offering (in shares)	4,000
Shares issued in primary offering	$ 4	252,058				252,062
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)	224
Exercise of options to purchase common stock		2,271				2,271
Issuance of restricted stock units (in shares)	78
Issuance of restricted stock units		(4,187)				(4,187)
Share-based compensation expense		25,068				25,068
Foreign Currency Translation				(40)		(40)
Net (loss)			(29,699)			(29,699)
Shares issued in primary offering (in shares)	2,415
Shares issued in primary offering	$ 2	332,170				332,172
Balances (in shares) at Dec. 31, 2021	43,449				14
Balances at Dec. 31, 2021	$ 43	$ 955,710	$ (235,623)	$ (120)	$ (256)	$ 719,754