Consolidated Statements of Convertible Preferred Stock, Non-controlling Interest and Stockholders' (Deficit) Equity (Temporary) (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Series C preferred stock	Series F Preferred Stock	Series G Preferred Stock	Temporary equity, parent Series B-G convertible preferred stock USD ($)	Temporary equity, parent Series C preferred stock USD ($)	Temporary equity, parent Series F Preferred Stock USD ($)	Temporary equity, parent Series G Preferred Stock USD ($)	Temporary equity, non-controlling interest USD ($)
Balance at Dec. 31, 2009					$ 131,273
Balance (in shares) at Dec. 31, 2009					41,368,000
Temporary equity
Issuance of stock							59,973
Issuance of stock (in shares)							11,776,000
Issuance of stock as a result of warrant exercises						11
Issuance of stock as a result of warrant exercises (in shares)						4,000
Ownership change in non-controlling interest									1,082
Loss attributable to non-controlling interest									(55)
Balance at Dec. 31, 2010					191,257				1,027
Balance (in shares) at Dec. 31, 2010					53,148,000
Temporary equity
Issuance of stock								76,949
Issuance of stock (in shares)								11,000,000
Issuance of stock as a result of warrant exercises						19
Issuance of stock as a result of warrant exercises (in shares)						3,000
Loss attributable to non-controlling interest									(453)
Balance at Dec. 31, 2011					268,225				574
Balance (in shares) at Dec. 31, 2011	64,151	14,424	11,776	11,000	64,151,000
Temporary equity
Conversion of convertible preferred stock into common stock	268,225				(268,225)
Conversion of convertible preferred stock into common stock (in shares)					(64,151,000)
Loss attributable to non-controlling interest									(477)
Balance at Dec. 31, 2012									$ 97