Organization and Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Assets Fair Value	$ 37,375	$ 36,959
Liabilities Fair Value, Total	3,909	347
Level 1 [Member] | Derivative Warrants [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] | Cash and cash equivalents [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Assets Fair Value	37,375	36,959
Level 2 [Member] | Derivative Warrants [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] | 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] | Derivative Warrants [Member]
Company fair value hierarchy for assets and liabilities measured at fair value on a recurring basis
Liabilities Fair Value, Total	3,909	347
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