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Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
May 16, 2018
Dec. 31, 2018
Dec. 31, 2019
Term Loans      
Amount of term loan facility $ 50,000   $ 51,975
Net proceeds from the loan $ 49,300 $ 49,292  
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      
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     (741)
Less: Unaccreted value of final fee     (1,220)
Loan payable     50,014
Loan payable, current portion     1,183
Loan payable, net of current portion   $ 49,209 $ 48,831
At Maturity      
Term Loans      
Final payment 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 7.45%