Debt (Details) $ in Thousands		1 Months Ended
	Dec. 21, 2018 USD ($) tranche	Jun. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)
Estimated future principal payments due
2022			$ 25,000
2023			25,000
Total debt			$ 50,000
2018 Credit Facility
Debt
Maximum amount outstanding	$ 75,000
Number of tranche | tranche	3
Borrowing	$ 25,000	$ 25,000
Period for commencing monthly principal payments	36 months
Amortization period	24 months
Prepayment fee in first year	1.00%
Prepayment fee in second year	0.50%
Prepayment fee in third year	0.25%
Issuance costs	$ 800
Debt default interest rate addition (as a percent)	4.00
2018 Credit Facility | One-month U.S. LIBOR
Debt
Variable interest rate	5.50%
2018 Credit Facility | Term loan
Debt
Borrowing	$ 25,000