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Derivative Financial Instruments - Changes in Outstanding Warrants (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Changes in derivative instrument liability      
Balance at the beginning of the period $ 216    
Change in fair value of warrants during the quarter (122) $ (260)  
Balance at the end of the period $ 94    
Derivative instrument liability      
Derivative Financial Instruments      
Balance of warrants outstanding (in shares) 210,000   210,000
Changes in derivative instrument liability      
Balance at the beginning of the period $ 216    
Change in fair value of warrants during the quarter (122)    
Balance at the end of the period $ 94