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Borrowings - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Oct. 31, 2017
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]            
Long-term borrowings   $ 39,093   $ 39,093   $ 38,963
Term Loan | Pharmakon Term Loan            
Debt Instrument [Line Items]            
Total loan proceeds $ 40,000          
Debt issuance costs $ 1,300          
Debt period payment, interest only period 35 months          
Debt interest stated percentage (percent) 11.50%          
Debt closing fee percentage (percent) 1.50%          
Debt instrument fee amount $ 600          
Debt covenant minimum cash balance $ 5,000          
Effective interest rate during the period (percent)   12.30% 12.30% 12.20% 12.20%  
Term Loan | Pharmakon Term Loan | Prepayment Penalty, 31-48 Months            
Debt Instrument [Line Items]            
Debt prepayment penalty percentage (percent) 2.00%          
Term Loan | Pharmakon Term Loan | Prepayment Penalty, 49-60 Months            
Debt Instrument [Line Items]            
Debt prepayment penalty percentage (percent) 1.00%