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Debt - Term Loan (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jun. 30, 2018
Nov. 30, 2015
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 $ 15,000    
Unamortized debt discount $ 88,000    
Loss on debt extinguishment     88,000
Interest expense     163
Accretion of the debt discount     $ 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%