Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings (Accumulated Deficit) [Member]
Beginning balance (in shares) at Dec. 31, 2012		27,092,242
Beginning balance at Dec. 31, 2012	$ 375,186	$ 28	$ 310,017	$ (26,512)	$ 43	$ 91,610
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net issuance of common stock under stock option plans, shares		762,311
Net issuance of common stock under stock option plans	9,374	$ 1	9,358	15
Stock-based compensation	15,473		15,473
Excess tax benefit related to stock options			384
Comprehensive Income (Loss)	(110)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss)	(110)				(110)
Net income	(13,769)					(13,769)
Total comprehensive loss	(13,879)
Ending balance (in shares) at Dec. 31, 2013		27,854,553
Ending balance at Dec. 31, 2013	386,538	$ 29	335,232	(26,497)	(67)	77,841
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net issuance of common stock under stock option plans, shares		541,221
Net issuance of common stock under stock option plans	1,328	$ 1	1,307	20
Stock-based compensation	16,827		16,827
Excess tax benefit related to stock options	$ 9,900
Treasury Stock Acquired During Period, Shares	(1,000,000)
Treasury Stock, Value, Acquired, Cost Method	$ (19,270)			(19,270)
Comprehensive Income (Loss)	(1,192)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss)	(1,192)				(1,192)
Net income	(19,111)					(19,111)
Total comprehensive loss	$ (20,303)
Ending balance (in shares) at Dec. 31, 2014	27,395,774.000	27,395,774
Ending balance at Dec. 31, 2014	$ 365,120	$ 30	353,366	(45,747)	(1,259)	58,730
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net issuance of common stock under stock option plans, shares		376,502
Net issuance of common stock under stock option plans	(1,999)		(1,999)
Stock-based compensation	$ 15,262		15,262
Excess tax benefit related to stock options			0
Treasury Stock Acquired During Period, Shares	(1,250,000)
Treasury Stock, Value, Acquired, Cost Method	$ (21,438)			(21,438)
Comprehensive Income (Loss)	60
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss)	60				60
Net income	(15,128)					(15,128)
Total comprehensive loss	$ (15,068)
Ending balance (in shares) at Dec. 31, 2015	26,522,276	26,522,276
Ending balance at Dec. 31, 2015	$ 341,877	$ 30	$ 366,629	$ (67,185)	$ (1,199)	$ 43,602