Adoption of ASC Topic 842, Leases - Right-of-Use Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use asset, gross	$ 27,834	$ 26,449
Addition of right-of-use assets	1,385
Less: accumulated amortization	(4,041)
Operating lease right-of-use asset, net	$ 23,793		$ 0