CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ 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		54,003,000
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)		5,750,000
Common stock offering, net of issuance costs	87,401	$ 58	87,343
Stock-based compensation (in shares)		461,000
Stock-based compensation	1,886	$ 3	1,883
Purchase of common stock for retirement (in shares)		(76,000)
Purchase of common stock for retirement	(1,321)		(1,321)
Exercise of stock options (in shares)		4,000
Exercise of stock options	58		58
Other comprehensive income	3,996				3,996
Net income (loss)	(62,227)			(62,227)
Balance at period end (in shares) at Mar. 31, 2021		60,142,000
Balance at period end at Mar. 31, 2021	276,067	$ 601	814,467	(539,255)	254
Balance at period start (in shares) at Dec. 31, 2020		54,003,000
Balance at period start at Dec. 31, 2020	246,274	$ 540	726,504	(477,028)	(3,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(89,383)
Balance at period end (in shares) at Sep. 30, 2021		60,193,000
Balance at period end at Sep. 30, 2021	253,502	$ 602	819,057	(566,411)	254
Balance at period start (in shares) at Mar. 31, 2021		60,142,000
Balance at period start at Mar. 31, 2021	276,067	$ 601	814,467	(539,255)	254
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock offering, net of issuance costs	(208)		(208)
Stock-based compensation (in shares)		1,000
Stock-based compensation	2,079		2,079
Purchase of common stock for retirement	(2)		(2)
Issuance of common stock for employee stock purchase plan (in shares)		42,000
Issuance of common stock for employee stock purchase plan	714	$ 1	713
Net income (loss)	(108,958)			(108,958)
Balance at period end (in shares) at Jun. 30, 2021		60,185,000
Balance at period end at Jun. 30, 2021	169,692	$ 602	817,049	(648,213)	254
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		(5,000)
Stock-based compensation	2,023		2,023
Purchase of common stock for retirement (in shares)		13,000
Purchase of common stock for retirement	(15)		(15)
Net income (loss)	81,802			81,802
Balance at period end (in shares) at Sep. 30, 2021		60,193,000
Balance at period end at Sep. 30, 2021	$ 253,502	$ 602	819,057	(566,411)	254
Balance at period start (in shares) at Dec. 31, 2021	60,161,955	60,162,000
Balance at period start at Dec. 31, 2021	$ 265,700	$ 602	821,713	(559,117)	2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		412,000
Stock-based compensation	3,658	$ 3	3,655
Purchase of common stock for retirement (in shares)		(462,000)
Purchase of common stock for retirement	(6,390)	$ (4)	(1,431)	(4,955)
Net income (loss)	(137,051)			(137,051)
Balance at period end (in shares) at Mar. 31, 2022		60,112,000
Balance at period end at Mar. 31, 2022	$ 125,917	$ 601	823,937	(701,123)	2,502
Balance at period start (in shares) at Dec. 31, 2021	60,161,955	60,162,000
Balance at period start at Dec. 31, 2021	$ 265,700	$ 602	821,713	(559,117)	2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 279,470
Balance at period end (in shares) at Sep. 30, 2022	60,157,574	60,158,000
Balance at period end at Sep. 30, 2022	$ 546,892	$ 601	829,195	(285,406)	2,502
Balance at period start (in shares) at Mar. 31, 2022		60,112,000
Balance at period start at Mar. 31, 2022	125,917	$ 601	823,937	(701,123)	2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		3,000
Stock-based compensation	2,017		2,017
Purchase of common stock for retirement (in shares)		(1,000)
Purchase of common stock for retirement	(94)		(94)
Exercise of stock options (in shares)		65,000
Exercise of stock options	1,132	$ 1	1,131
Issuance of common stock for employee stock purchase plan (in shares)		41,000
Issuance of common stock for employee stock purchase plan	632		632
Net income (loss)	149,125			149,125
Balance at period end (in shares) at Jun. 30, 2022		60,220,000
Balance at period end at Jun. 30, 2022	278,729	$ 602	827,623	(551,998)	2,502
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (in shares)		(2,000)
Stock-based compensation	1,613		1,613
Purchase of common stock for retirement (in shares)		(60,000)
Purchase of common stock for retirement	(846)	$ (1)	(41)	(804)
Net income (loss)	$ 267,396			267,396
Balance at period end (in shares) at Sep. 30, 2022	60,157,574	60,158,000
Balance at period end at Sep. 30, 2022	$ 546,892	$ 601	$ 829,195	$ (285,406)	$ 2,502