Nature of Business and Significant Accounting Policies, Nature of Business, Going Concern, Basis of Presentation, Accounts Receivable and Inventories (Details) $ in Thousands			12 Months Ended
	Oct. 09, 2020	Oct. 06, 2020	Dec. 31, 2020 USD ($) Customer	Dec. 31, 2019 USD ($) Customer	Mar. 19, 2021 USD ($)
Nature of Business [Abstract]
Reverse stock split ratio	0.033
Going Concern [Abstract]
Accumulated deficit			$ (233,338)	$ (217,502)
Basis of Presentation [Abstract]
Gain on dissolution of foreign subsidiary			$ 1,202
Accounts Receivable [Abstract]
Accounts receivables maximum credit period from invoice date			30 days
Allowance for doubtful accounts			$ 0	0
Inventories [Abstract]
Finished Goods			1,343	750
Work in Process			342	79
Raw Materials			1,272	968
Total			$ 2,957	$ 1,797
Subsequent Event [Member]
Going Concern [Abstract]
Net proceeds from issuance of public offering					$ 57,700
Minimum [Member]
Nature of Business [Abstract]
Reverse stock split ratio		0.2
Maximum [Member]
Nature of Business [Abstract]
Reverse stock split ratio		0.033
Accounts Receivable [Member]
Revenue, Performance Obligation [Abstract]
Number of major customers | Customer			0	2
Accounts Receivable [Member] | Customer One [Member]
Revenue, Performance Obligation [Abstract]
Concentration risk percentage				13.00%
Accounts Receivable [Member] | Customer Two [Member]
Revenue, Performance Obligation [Abstract]
Concentration risk percentage				12.00%