Other Expense - Schedule of Other Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income And Expenses [Abstract]
Interest income	$ 15	$ 41
Interest expense	(142)	(276)
Change in fair value of derivative liability		(320)
Realized gain (loss) on disposal of equipment	44
Total other income (expenses)	$ (83)	$ (555)