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Debt - Term Loan (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2018
Nov. 30, 2015
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]          
Loss on debt extinguishment       $ 88  
Accretion of the debt discount       75  
Secured Debt | Term Loan          
Debt Instrument [Line Items]          
Principal amount   $ 8,000      
Interest rate (as a percent)   7.50%      
Principal balance repurchased $ 2,900        
Final balloon payment $ 640        
Early payment penalty fee (as a percent) 1.00%        
Early payment penalty fee amount $ 15        
Unamortized debt discount $ 88        
Loss on debt extinguishment         $ 88
Interest expense     $ 0 129  
Accretion of the debt discount     $ 0 $ 75  
Final payment fee (as a percent)   8.00%      
Secured Debt | Term Loan | Repaid on or before first anniversary          
Debt Instrument [Line Items]          
Early payment penalty fee (as a percent)   3.00%      
Secured Debt | Term Loan | Repaid on or before second anniversary          
Debt Instrument [Line Items]          
Early payment penalty fee (as a percent)   2.00%      
Secured Debt | Term Loan | Repaid after second anniversary before maturity date          
Debt Instrument [Line Items]          
Early payment penalty fee (as a percent)   1.00%      
Secured Debt | Term Loan | London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
Variable rate spread (as a percent)   7.30%