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Convertible Notes Payable - Summary of Convertible Notes Outstanding (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Current portion of convertible notes payable, net of discount $ 0 $ 0
Convertible notes payable, long term 1,568 $ 0
Senior Secured Convertible Notes [Member]    
Debt Instrument [Line Items]    
Convertible notes payable, principal 35,000  
Debt discounts (33,432)  
Net convertible note payable 1,568  
Convertible notes payable, long term $ 1,568