Operating Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease right-of-use asset	$ 120	$ 496
Operating lease liability	115
Operating lease rent expense	600	1,000
Operating lease rent expense			$ 800
Cash paid from operating cash flows	$ 600	$ 1,000
Operating lease, weighted average remaining lease term	2 years 1 month 6 days
Weighted average estimated incremental borrowing rate	3.40%