STOCKHOLDERS' EQUITY (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended			1 Months Ended			9 Months Ended				9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 item	Sep. 30, 2012	Dec. 31, 2012	Aug. 31, 2011 Maximum	Sep. 30, 2013 Restricted common stock	Dec. 31, 2012 Restricted common stock	Sep. 30, 2013 Common Stock	Sep. 30, 2013 Common stock, excluding unvested restricted stock	Sep. 30, 2013 Treasury Stock	Dec. 31, 2012 Treasury Stock	Sep. 30, 2013 Additional Paid-In Capital	Sep. 30, 2013 Accumulated Deficit	Sep. 30, 2013 Accumulated Other Comprehensive Loss
Changes in stockholders' equity
Balance at the beginning of the period			$ 127,439						$ 416		$ (57)	$ (57)	$ 233,659	$ (104,135)	$ (2,444)
Balance at the beginning of the period (in shares)										41,553,178
Balance at the beginning of the period (in shares)											3,722	3,722
Stock-based compensation (in shares)										154,672
Stock-based compensation			1,730						1				1,729
Employee stock purchase plan (in shares)										7,438
Employee stock purchase plan			18										18
Net loss	(5,934)	667	(14,635)	(83,885)										(14,635)
Foreign currency translation, net of tax	548	287	297	(292)											297
Balance at the end of the period	114,849		114,849						417		(57)	(57)	235,406	(118,770)	(2,147)
Balance at the end of the period (in shares)										41,715,288
Balance at the end of the period (in shares)											3,722	3,722
Preferred stock, authorized (in shares)	20,000,000		20,000,000		20,000,000
Preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01		$ 0.01
Preferred stock, shares issued	0		0		0
Preferred stock, shares outstanding	0		0		0
Common stock, authorized (in shares)	200,000,000		200,000,000		200,000,000
Common stock, par value (in dollars per share)	$ 0.01		$ 0.01		$ 0.01
Common stock, issued (in shares)	41,861,635		41,861,635		41,684,960
Common stock, outstanding (in shares)	41,857,913		41,857,913		41,681,238
Number of voting rights entitled per share of common stock owned			1
Restricted unvested common stock							142,625	128,060
Repurchase of equity interest						2,000
Shares held in treasury	3,722	3,722	3,722	3,722
Cost of treasury stock	$ 57	$ 57	$ 57	$ 57