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Derivative Financial Instruments - Changes in Outstanding Warrants (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Changes in derivative instrument liability            
Balance at the beginning of the period   $ 216   $ 216    
Change in fair value of warrants during the quarter $ (39)   $ 23 (161) $ (237)  
Balance at the end of the period $ 55     $ 55    
Derivative instrument liability            
Derivative Financial Instruments            
Balance of warrants outstanding (in shares) 210,000     210,000   210,000
Changes in derivative instrument liability            
Balance at the beginning of the period   216   $ 216    
Change in fair value of warrants during the quarter $ (39) $ (122)        
Balance at the end of the period $ 55     $ 55