Consolidated Statements of Stockholders' Equity (Deficit) and Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	Total	Common stock	Additional Paid-in Capital	Accumulated Deficit	Treasury stock	Accumulated Other Comprehensive Income (loss)	Comprehensive Income (loss)
Balance at Dec. 31, 2008	$ (2,246)	$ 2	$ 337,707	$ (263,333)	$ (76,670)	$ 48
Balance (in shares) at Dec. 31, 2008		25,438			2,793
Increase (Decrease) in Stockholders' Equity
Stock-based compensation to employees and directors	4,775		4,775
Stock-based compensation to consultants in exchange for services	10		10
Exercise of stock options	29		29
Exercise of stock options (in shares)		2
Common stock issued upon vesting of restricted stock (in shares)		110
Purchase of treasury stock	(340)				(340)
Purchase of treasury stock (in shares)					36
Treasury stock issued for 401(k) matching contributions	354			(470)	824
Treasury stock issued for 401(k) matching contributions (in shares)					(22)
Issuance of redeemable common stock (Note 15)	(400)		(400)
Issuance of redeemable common stock (Note 15) (in shares)		(39)
Lapse of rescission rights of redeemable common stock (Note 15)	967		967
Lapse of rescission rights of redeemable common stock (Note 15) (in shares)		72
Deemed dividend related to redeemable common stock (Note 15)	(48)		(48)
Comprehensive income:
Net income (loss)	7,747			7,747			7,747
Reclassification adjustment included in net income	(48)					(48)	(48)
Total comprehensive income (loss)	7,699						7,699
Balance at Dec. 31, 2009	10,800	2	343,040	(256,056)	(76,186)
Balance (in shares) at Dec. 31, 2009		25,583			2,807
Increase (Decrease) in Stockholders' Equity
Stock-based compensation to employees and directors	5,056		5,056
Exercise of stock options	1,503		1,503
Exercise of stock options (in shares)		90
Common stock issued upon vesting of restricted stock (in shares)		185
Purchase of treasury stock	(825)				(825)
Purchase of treasury stock (in shares)					63
Treasury stock issued for 401(k) matching contributions	87			(160)	247
Treasury stock issued for 401(k) matching contributions (in shares)					(7)
Redeemable common stock repurchased under rescission offer (in shares)		1			(1)
Lapse of rescission rights of redeemable common stock (Note 15)	260		260
Lapse of rescission rights of redeemable common stock (Note 15) (in shares)		18
Deemed dividend related to redeemable common stock (Note 15)	(112)		(112)
Comprehensive income:
Net income (loss)	13,889			13,889			13,889
Total comprehensive income (loss)	13,889						13,889
Balance at Dec. 31, 2010	30,658	2	349,747	(242,327)	(76,764)
Balance (in shares) at Dec. 31, 2010		25,877			2,862
Increase (Decrease) in Stockholders' Equity
Stock-based compensation to employees and directors	3,051		3,051
Common stock issued upon vesting of restricted stock (in shares)		318
Purchase of treasury stock	(1,604)				(1,604)
Purchase of treasury stock (in shares)					100
Lapse of rescission rights of redeemable common stock (Note 15)	582		582
Lapse of rescission rights of redeemable common stock (Note 15) (in shares)		46
Deemed dividend related to redeemable common stock (Note 15)	(12)		(12)
Comprehensive income:
Net income (loss)	(19,438)			(19,438)			(19,438)
Total comprehensive income (loss)	(19,438)						(19,438)
Balance at Dec. 31, 2011	$ 13,237	$ 2	$ 353,368	$ (261,765)	$ (78,368)
Balance (in shares) at Dec. 31, 2011		26,241			2,962