Quarterly report pursuant to Section 13 or 15(d)

Stock Purchase Warrants (Details 1)

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Stock Purchase Warrants (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]    
Beginning Balance $ 10,567  
Change in fair value of warrant liability 498 $ 4,152
Ending Balance $ 11,065 $ 10,900