CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Income
Balance at period start (in shares) at Dec. 31, 2019		53,254
Balance at period start at Dec. 31, 2019	$ 648,242	$ 533	$ 715,069	$ (67,942)	$ 582
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)		145
Issuance of common stock for employee stock purchase plan	1,553	$ 2	1,551
Exercise of stock option / common stock warrants (in shares)		351
Exercise of stock option / common stock warrants	3,936	$ 3	3,933
Share-based compensation (in shares)		322
Stock-based compensation	7,109	$ 3	7,106
Purchase of common stock for retirement (in shares)		(69)
Purchase of common stock for retirement	(1,156)	$ (1)	(1,155)
Other comprehensive income	(4,324)				(4,324)
Net income (loss)	(409,086)			(409,086)
Balance at period end (in shares) at Dec. 31, 2020		54,003
Balance at period end at Dec. 31, 2020	246,274	$ 540	726,504	(477,028)	(3,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)		85
Issuance of common stock for employee stock purchase plan	1,421	$ 1	1,420
Common stock offering, net of issuance costs (in shares)		5,750
Common stock offering, net of issuance costs	87,193	$ 58	87,135
Exercise of stock option / common stock warrants (in shares)		4
Exercise of stock option / common stock warrants	58		58
Share-based compensation (in shares)		443
Stock-based compensation	7,952	$ 4	7,948
Purchase of common stock for retirement (in shares)		(123)
Purchase of common stock for retirement	(2,145)	$ (1)	(1,352)	(792)
Other comprehensive income	6,244				6,244
Net income (loss)	(81,297)			(81,297)
Balance at period end (in shares) at Dec. 31, 2021		60,162
Balance at period end at Dec. 31, 2021	265,700	$ 602	821,713	(559,117)	2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)		67
Issuance of common stock for employee stock purchase plan	1,244		1,244
Exercise of stock option / common stock warrants (in shares)		349
Exercise of stock option / common stock warrants	6,444	$ 4	6,440
Share-based compensation (in shares)		417
Stock-based compensation	9,166	$ 3	9,163
Purchase of common stock for retirement (in shares)		(524)
Purchase of common stock for retirement	(7,833)	$ (5)	(2,069)	(5,759)
Other comprehensive income	5,627				5,627
Net income (loss)	364,189			364,189
Balance at period end (in shares) at Dec. 31, 2022		60,471
Balance at period end at Dec. 31, 2022	$ 644,537	$ 604	$ 836,491	$ (200,687)	$ 8,129