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Fair Value Measurements - Reconciliation of Embedded Derivative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Apr. 11, 2016
Apr. 01, 2016
Kanis Agreement | Convertible Debt      
Reconciliation of warrant liability and embedded derivative      
Liquidity event discount (as a percent)     25.00%
Fair value of convertible notes payable $ 7,400    
Note Purchase Agreement with Haldor Topse | Convertible Debt      
Reconciliation of warrant liability and embedded derivative      
Fair value of convertible notes payable 1,100    
$0.5 million, 8% convertible director note due 2017 | Convertible Debt      
Reconciliation of warrant liability and embedded derivative      
Liquidity event discount (as a percent)   25.00%  
Fair value of convertible notes payable 500    
Embedded Derivative      
Reconciliation of warrant liability and embedded derivative      
Initial valuation of bifurcated derivative liability 3,936    
Remeasurement of bifurcated derivative liability (2,754)    
Balance at end of period $ 1,182