Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Restricted Stock Units (RSUs) [Member] Common Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Total
Balance (in shares) at Dec. 31, 2017		14,688
Balance at Dec. 31, 2017		$ 147	$ 68,617	$ 199,511	$ (4,784)	$ 263,491
Issuance of common stock for equity awards (in shares)		362
Issuance of common stock for equity awards		$ 4	2,882	0	0	2,886
Retirement of common stock for minimum tax withholdings (in shares)		(34)
Retirement of common stock for minimum tax withholdings		$ (1)	(1,790)	0	0	(1,791)
Stock-based compensation expense		$ 0	11,046	0	0	11,046
Repurchase of common stock (in shares)		(806)
Repurchase of common stock		$ (8)	(29,992)	0	0	(30,000)
Net income (loss)		0	0	18,722	0	18,722
Other comprehensive income (loss)		$ 0	0	0	(742)	(742)
Balance (in shares) at Dec. 31, 2018		14,210
Balance at Dec. 31, 2018		$ 142	50,763	218,233	(5,526)	263,612
Issuance of common stock for equity awards (in shares)		551
Issuance of common stock for equity awards		$ 6	22,145	0	0	22,151
Retirement of common stock for minimum tax withholdings (in shares)		(5)
Retirement of common stock for minimum tax withholdings		$ 0	(293)	0	0	(293)
Stock-based compensation expense		$ 0	6,087	0	0	6,087
Repurchase of common stock (in shares)		(452)
Repurchase of common stock		$ (5)	(29,995)	0	0	(30,000)
Net income (loss)		0	0	27,193	0	27,193
Other comprehensive income (loss)		$ 0	0	0	(372)	(372)
Vesting of restricted stock units (in shares)	17
Forfeiture of restricted stock awards (in shares)		(13)
Balance (in shares) at Dec. 31, 2019		14,308
Balance at Dec. 31, 2019		$ 143	48,707	245,426	(5,898)	288,378
Issuance of common stock for equity awards (in shares)		123
Issuance of common stock for equity awards		$ 1	1,523	0	0	1,524
Retirement of common stock for minimum tax withholdings (in shares)		(8)
Retirement of common stock for minimum tax withholdings		$ 0	(262)	0	0	(262)
Stock-based compensation expense		$ 0	5,386	0	0	5,386
Repurchase of common stock (in shares)		(139)
Repurchase of common stock		$ (1)	1	0	0	0
Net income (loss)		0	0	(23,982)	0	(23,982)
Other comprehensive income (loss)		$ 0	0	0	1,356	1,356
Vesting of restricted stock units (in shares)		54
Forfeiture of restricted stock awards (in shares)		(9)
Balance (in shares) at Dec. 31, 2020		14,329
Balance at Dec. 31, 2020		$ 143	$ 55,355	$ 221,444	$ (4,542)	$ 272,400