Leases - Lease Cost and Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Total lease expense	$ 1,358	$ 1,632	$ 1,798
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from leases	1,334	1,978
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 801	$ 0