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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]  
Reconciliation of liabilities measured at fair value using significant unobservable inputs
The following table provides a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the three months ended March 31, 2015 (in thousands): 
 
Common Stock Warrant Liabilities
Balance at December 31, 2014
$
8,702

Issuance

Changes in fair value
115

Balance at March 31, 2015
$
8,817