Accrued Other Expenses - Summary of Accrued Other Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accrued Liabilities, Current [Abstract]
Accrued consulting fees	$ 99	$ 112
Accrued recruiting fees	71	40
Accrued computer related expenses	26	7
Accrued legal and accounting fees	19	15
Accrued financing costs	0	639
Accrued other	16	32
Total	$ 231	$ 845