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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Fair Value, Liabilities Measured on Recurring Basis
The following table presents the changes in the Level 3 instruments measured at fair value on a recurring basis for the three and six months ended June 30, 2014 (in thousands):
 
 
 
Three Months Ended June 30, 2014
 
Six Months Ended June 30, 2014
Warrant liability balance - beginning of period
 
$
11,078

 
$
4,446

Issuance of warrants at fair value
 
4

 
4

Change in fair value
 
2,190

 
8,822

Warrant liability balance - end of period
 
$
13,272

 
$
13,272