Organization and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Assets Fair Value	$ 18,038			$ 36,959
Derivative warrants Fair value	170	170	402	78
Equity warrants Fair Value	0			209
Liabilities Fair Value, Total	170			287
Level 1 [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Liabilities Fair Value, Total	0			0
Level 1 [Member] | Derivative Warrants [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Derivative warrants Fair value	0			0
Level 1 [Member] | Equity Warrant [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Equity warrants Fair Value	0			0
Level 1 [Member] | Cash and cash equivalents [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Assets Fair Value	18,038			36,959
Level 2 [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Liabilities Fair Value, Total	0			0
Level 2 [Member] | Derivative Warrants [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Derivative warrants Fair value	0			0
Level 2 [Member] | Equity Warrant [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Equity warrants Fair Value	0			0
Level 2 [Member] | Cash and cash equivalents [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Assets Fair Value	0			0
Level 3 [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Derivative warrants Fair value	0			0
Liabilities Fair Value, Total	170			287
Level 3 [Member] | Derivative Warrants [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Derivative warrants Fair value	170			78
Level 3 [Member] | Equity Warrant [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Equity warrants Fair Value	0			209
Level 3 [Member] | Cash and cash equivalents [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Assets Fair Value	$ 0			$ 0