Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Stockholders' Equity, Balance at beginning of period at Dec. 31, 2011	$ 76,569	$ 59	$ 241,441	$ (164,240)	$ (661)	$ (30)
Common Stock, Shares, Balance at beginning of period (in shares) at Dec. 31, 2011		58,577,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised (in shares)		1,168,000
Exercise of common stock options	4,992	1	4,991
Employee stock purhcase plan (in shares)		224,000
Employee stock puchase plan	2,369		2,369
Sale of Common Stock (in shares)		3,105,000
Sale of Common Stock	40,069	3	40,066
Stock compensation expense	3,649		3,649
Issuance of restricted stock (in shares)		13,000
Issuance of restricted stock	0
Cancellation of restricted stock (in shares)		(18,000)
Restricted stock expense	1,906		1,906
Non-employee restricted stock expense	916		916
Net loss	(35,774)			(35,774)
Other comprehensive income (loss) foreign currency translation	(222)					(222)
Stockholders' Equity, Balance at end of period at Dec. 31, 2012	94,474	63	295,338	(200,014)	(661)	(252)
Common Stock, Shares, Balance at ending of period (in shares) at Dec. 31, 2012		63,069,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised (in shares)		974,000
Exercise of common stock options	4,875	1	4,874
Employee stock purhcase plan (in shares)		216,000
Employee stock puchase plan	2,444		2,444
Stock compensation expense	4,627		4,627
Issuance of restricted stock (in shares)		(54,000)
Issuance of restricted stock	0
Issuance of common stock (in shares)		48,000
Issuance of common stock	752		752
Treasury stock retired (in shares)		(495,000)
Treasury stock retired	0		(661)		661
Restricted stock expense	2,476		2,476
Non-employee restricted stock expense	819		819
Equity conversion option	19,324		19,324
Debt issuance costs allocated to equity	(819)		(819)
Capped call	(7,418)		(7,418)
Net loss	(16,068)			(16,068)
Other comprehensive income (loss) foreign currency translation	(845)					(845)
Stockholders' Equity, Balance at end of period at Dec. 31, 2013	104,641	64	321,756	(216,082)	0	(1,097)
Common Stock, Shares, Balance at ending of period (in shares) at Dec. 31, 2013	63,866,392	63,866,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercised (in shares)		315,000
Exercise of common stock options	1,776	0	1,776
Employee stock purhcase plan (in shares)		254,000
Employee stock puchase plan	2,613		2,613
Stock compensation expense	5,172		5,172
Issuance of restricted stock (in shares)		145,000
Issuance of restricted stock	0
Issuance of common stock (in shares)		2,684,000
Issuance of common stock	38,630		38,627
Treasury stock retired (in shares)		(58,000)
Treasury stock retired	(2,328)				(2,328)
Restricted stock expense	2,620		2,620
Non-employee restricted stock expense	75		75
Net loss	(32,418)			(32,418)
Other comprehensive income (loss) foreign currency translation	3,369					3,369
Stockholders' Equity, Balance at end of period at Dec. 31, 2014	$ (124,150)	$ 67	$ (372,639)	$ (248,500)	$ (2,328)	$ 2,272
Common Stock, Shares, Balance at ending of period (in shares) at Dec. 31, 2014	67,159,511	67,322,000