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Borrowing (Details) - USD ($)
$ in Thousands
May 16, 2018
Mar. 31, 2020
Dec. 31, 2019
Term Loans      
Amount of term loan facility $ 50,000 $ 51,975  
Base interest rate 7.45%    
Equal monthly installment $ 2,100    
Percentage of premium payable on redemption of the term loan 1.00%    
Amount of fee payable upon closing of the term loan $ 500    
Additional default interest rate 4.00%    
Future debt payment obligations      
Remainder of 2020   2,083  
2021   25,000  
2022   24,892  
Total principal and final fee payments $ 50,000 51,975  
Less: Unamortized discount and debt issuance costs   (652)  
Less: Unaccreted value of final fee   (1,093)  
Loan payable   50,230  
Loan payable, current portion   7,437 $ 1,183
Loan payable, net of current portion   $ 42,793 $ 48,831
At Maturity      
Term Loans      
Prepayment fee (as a percent) 3.95%    
Prior to first anniversary of closing date      
Term Loans      
Prepayment fee (as a percent) 3.00%    
After first anniversary of closing date      
Term Loans      
Prepayment fee (as a percent) 2.00%    
After second anniversary to maturity date      
Term Loans      
Prepayment fee (as a percent) 1.00%    
LIBOR      
Term Loans      
Floating interest rate one-month LIBOR