Supplemental Disclosure of Cash Flow and Non-Cash Investing and Financing Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Supplemental Cash Flow Elements [Abstract]
Cash paid for interest	$ 1,094	$ 1,840
Income taxes paid	4	6
Non-cash activities:
Lease right of use asset and liability	189	0
Note receivable for sale of property and equipment	75	0
Purchases of equipment in accounts payable	159	0
Fair value of non-cash consideration received for option exercise	380	0
Deemed dividends on Series B Convertible Preferred Stock	$ 462	$ 0