Commitments and Contingencies - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Leases, Other Information
Financing cash flows from finance leases	$ 37	$ 0
Right-of-use assets obtained in exchange for new finance lease liabilities	2,093
Right-of-use assets obtained in exchange for new operating lease liabilities	3,674
Opening adjustment to right-of-use operating asset upon lease commencement	$ 2,850