Represents the typical credit period from the invoice date, after which unpaid accounts are individually analyzed for collectability in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Nature of Business and Basis of Presentation, Nature of Business, Going Concern, Accounts Receivable and Inventories (Details) $ in Thousands		3 Months Ended		12 Months Ended
	Mar. 19, 2021 USD ($)	Mar. 31, 2021 USD ($) Customer	Mar. 31, 2020 USD ($) Customer	Dec. 31, 2020 USD ($) Customer
Going Concern [Abstract]
Accumulated deficit		$ (238,559)		$ (233,338)
Net proceeds from issuance of convertible preferred stock	$ 57,600
Proceeds from warrant exercises		$ 1	$ 289
Accounts Receivable [Abstract]
Accounts receivables maximum credit period from invoice date		30 days
Allowance for doubtful accounts		$ 0		0
Inventories [Abstract]
Finished Goods		1,232		1,343
Work in Process		315		342
Raw Materials		1,410		1,272
Total		$ 2,957		$ 2,957
Accounts Receivable [Member]
Revenue, Performance Obligation [Abstract]
Number of major customers \| Customer		1		0
Customer One [Member] \| Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Revenue, Performance Obligation [Abstract]
Percentage of net sales		12.00%
ASC 606 [Member] \| Net Sales [Member]
Revenue, Performance Obligation [Abstract]
Number of major customers \| Customer		3	3
ASC 606 [Member] \| Customer One [Member] \| Net Sales [Member] \| Customer Concentration Risk [Member]
Revenue, Performance Obligation [Abstract]
Percentage of net sales		16.00%	15.00%
ASC 606 [Member] \| Customer Two [Member] \| Net Sales [Member] \| Customer Concentration Risk [Member]
Revenue, Performance Obligation [Abstract]
Percentage of net sales		13.00%	13.00%
ASC 606 [Member] \| Customer Three [Member] \| Net Sales [Member] \| Customer Concentration Risk [Member]
Revenue, Performance Obligation [Abstract]
Percentage of net sales		12.00%	10.00%