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, 2020		54,003
Balance at period start at Dec. 31, 2020	$ 246,274	$ 540	$ 726,504	$ (477,028)	$ (3,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock offering, net of issuance costs (in shares)		5,750
Common stock offering, net of issuance costs	87,193	$ 58	87,135
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
Stock-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)
Exercise of stock options (in shares)		4
Exercise of stock options	58		58
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
Stock-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)
Exercise of stock options (in shares)		349
Exercise of stock options	6,444	$ 4	6,440
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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock for employee stock purchase plan (in shares)		61
Issuance of common stock for employee stock purchase plan	1,937		1,937
Stock-based compensation (in shares)		464
Stock-based compensation	11,342	$ 6	11,336
Purchase of common stock for retirement (in shares)		(1,946)
Purchase of common stock for retirement	(68,208)	$ (19)	(6,090)	(62,099)
Exercise of stock options (in shares)		706
Exercise of stock options	17,129	$ 6	17,123
Other comprehensive income	45				45
Net income (loss)	728,642			728,642
Balance at period end (in shares) at Dec. 31, 2023		59,756
Balance at period end at Dec. 31, 2023	$ 1,335,424	$ 597	$ 860,797	$ 465,856	$ 8,174