Other Expense - Schedule of Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Other Income and Expenses [Abstract]
Interest income	$ 1	$ 22	$ 25	$ 70
Interest expense	(78)	(212)	(331)	(730)
Change in fair value of derivative liability		0	0	(556)
Other income		1	0	1
Other (expenses)	(44)
Total other income (expenses)	$ (121)	$ (189)	$ (306)	$ (1,215)