Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued vendor costs	$ 166	$ 229
Financed insurance payable	133	258
Other	76	61
Accrued expenses	$ 375	$ 548