Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Liabilities Disclosure [Abstract]
Accrued compensation costs	$ 421	$ 411
Accrued professional fees	208	236
Accrued taxes and regulatory fees	172	137
Customer deposits	51	127
Other accrued expenses and liabilities	138	286
Accrued dividends on Series A-2 Preferred Stock	0	4
Accrued expenses and other current liabilities	$ 990	$ 1,201