Leases - Summary (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) lease	Mar. 31, 2020 USD ($)
Leases
Number of finance leases | lease	0
Number of operating leases | lease	1
Operating lease expense | $	$ 38,000	$ 48,000
Operating lease expense information:
Cash paid for amounts included in measurement of lease liabilities | $	$ 32,000	$ 44,000
Weighted-average remaining lease term (years)	9 months
Weighted-average discount rate	15.20%