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Fair Value Measurements - Level 3 (Details) - Stock Warrant Liability
$ in Thousands
9 Months Ended
Sep. 30, 2016
USD ($)
Reconciliation of liabilities measured at fair value using level 3 significant unobservable inputs (Level 3) on a recurring basis  
Beginning balance $ 105
Change in the fair value of stock warrants (43)
Common Stock  
Reconciliation of liabilities measured at fair value using level 3 significant unobservable inputs (Level 3) on a recurring basis  
Issuance of Shares in connection with the settlements $ (62)