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, 2016		14,627
Balance at Dec. 31, 2016		$ 146	$ 61,735	$ 168,209	$ (7,317)	$ 222,773
Issuance of common stock for equity awards (in shares)		61
Issuance of common stock for equity awards		$ 1	313			314
Stock-based compensation expense			5,807			5,807
Net income				31,816		31,816
Other comprehensive income					2,533	2,533
Balance (in shares) at Dec. 31, 2017		14,688
Balance at Dec. 31, 2017		$ 147	68,617	199,511	(4,784)	263,491
Cumulative effect of change in accounting for stock-based compensation			762	(514)		248
Issuance of common stock for equity awards (in shares)		362
Issuance of common stock for equity awards		$ 4	2,882			2,886
Stock-based compensation expense			11,046			11,046
Net income				18,722		18,722
Other comprehensive income					(742)	(742)
Retirement of common stock for minimum tax withholdings (in shares)		(34)
Retirement of common stock for minimum tax withholdings		$ (1)	(1,790)			(1,791)
Repurchase of common stock (in shares)		(806)
Repurchase of common stock		$ (8)	(29,992)			(30,000)
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			22,151
Stock-based compensation expense			6,087			6,087
Net income				27,193		27,193
Other comprehensive income					(372)	(372)
Retirement of common stock for minimum tax withholdings (in shares)		(5)
Retirement of common stock for minimum tax withholdings			(293)			(293)
Repurchase of common stock (in shares)		(452)
Repurchase of common stock		$ (5)	(29,995)			(30,000)
Vesting of restricted stock units (in shares)	17
Forfeiture of restricted stock awards (in shares)		(13)
Forfeiture of restricted stock awards
Balance (in shares) at Dec. 31, 2019		14,308
Balance at Dec. 31, 2019		$ 143	$ 48,707	$ 245,426	$ (5,898)	$ 288,378