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Borrowing (Details) - USD ($) $ in Thousands	May 16, 2018	Sep. 30, 2020	Dec. 31, 2019
Term Loans
Amount of term loan facility	$ 50,000	$ 51,975
Base interest rate	7.45%
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
Total repayment obligations	$ 50,000	51,975
Less: Unamortized discount and debt issuance costs		(467)
Less: Unaccreted value of final fee		(827)
Loan payable		50,681
Loan payable, current portion			$ 1,183
Loan payable, net of current portion		$ 50,681	$ 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

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