Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid insurance	$ 131		$ 126
Prepaid expenses	253		233
Prepaid rent	74		80
Short-term deposits - non-inventory	18		0
Restricted cash	0		342
ERTC funds	445	$ 445	0
Other	3		1
Total prepaid and other current assets	$ 924		$ 782