Leases - Components of Lease Expense (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Finance lease expense:
Amortization of right-of-use assets	$ 81
Interest on lease liabilities	2
Operating lease expense	6,510
Short-term lease expense	918
Variable lease expense	199
Total lease expense	$ 7,710