Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Non-controlling Interest	Total
Balance at Dec. 31, 2011	$ 3	$ 170,721	$ (41,842)		$ 197	$ 129,079
Balance (in shares) at Dec. 31, 2011	33,584,000
Issuance of common stock upon exercise of stock options	1	2,573				2,574
Issuance of common stock upon exercise of stock options (in shares)	1,899,000					1,899,000
Stock-based compensation expense		2,735				2,735
Excess (deficient) tax benefits from stock-based compensation		2,190				2,190
Non-controlling interests distributions					(103)	(103)
Net (loss) income			7,295		729	8,024
Balance at Dec. 31, 2012	4	178,219	(34,547)		823	144,499
Balance (in shares) at Dec. 31, 2012	35,483,000
Issuance of common stock upon exercise of stock options (in shares)						461,000
Issuance of common stock under stock incentive plans		599				599
Issuance of common stock under stock incentive plans (in shares)	465,000
Repurchase and retirement of common stock			(4,848)			(4,848)
Repurchase and retirement of common stock (in shares)	(722,000)					(722,000)
Stock-based compensation expense		4,506				4,506
Excess (deficient) tax benefits from stock-based compensation		(397)				(397)
Non-controlling interests distributions					(608)	(608)
Net (loss) income			(3,968)		650	(3,318)
Balance at Dec. 31, 2013	4	182,927	(43,363)		865	140,433
Balance (in shares) at Dec. 31, 2013	35,226,000
Issuance of common stock upon exercise of stock options (in shares)						458,000
Issuance of common stock under stock incentive plans		1,158				1,158
Issuance of common stock under stock incentive plans (in shares)	1,041,000
Shares withheld for taxes		(1,922)				(1,922)
Stock-based compensation expense		7,562				7,562
Non-controlling interests distributions					(623)	(623)
Net (loss) income			(19,521)		754	(18,767)
Other comprehensive loss				(443)	32	(411)
Balance at Dec. 31, 2014	$ 4	$ 189,725	$ (62,884)	$ (443)	$ 1,028	$ 127,430
Balance (in shares) at Dec. 31, 2014	36,267,000