Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 3,849	$ 4,346
Restricted cash	303	303
Accounts receivable, net	5,513	7,035
Account receivable-due from government awards		501
Unbilled accounts receivable	2,665	2,438
Inventories	8,804	8,709
Prepaid expenses and other current assets	688	594
Total current assets	21,822	23,926
Property, plant and equipment, net	51,171	49,099
Operating lease right-of-use assets	37	53
Intangibles and other assets	27	29
Total assets	73,057	73,107
Current liabilities:
Accounts payable	1,199	2,077
Accrued compensation	1,856	1,662
Revolving credit facility, net		1,037
Other accrued expenses	961	659
Deferred revenue	12	12
Operating lease liability - current	38	54
Finance lease liability - current	1,229	1,229
Other current liabilities	471	231
Total current liabilities	5,766	6,961
Other liability - long term	14	14
Deferred income - government awards - long term	31,136	28,729
Finance lease liability - long term	13,545	13,608
Total liabilities	50,461	49,312
Commitments and contingencies (Note 8)
Shareholders' equity:
Preferred stock, $.001 par value: authorized 10,000,000 shares: Series B Convertible Preferred stock, (liquidation preference of $5,356) stated value $1,000 per share, $0.001 par value: 10,000 shares designated and 5,356 issued and outstanding as of March 31, 2023 and 5,356 issued and outstanding as of December 31, 2022.
Common stock, $0.001 par value: authorized 200,000,000 shares, issued 82,530,660 shares, outstanding 82,368,594 shares as of March 31, 2023 and issued 81,241,516 shares, outstanding 81,079,450 shares as of December 31, 2022.	82	80
Additional paid-in capital	284,002	282,582
Accumulated deficit	(260,988)	(258,367)
Treasury stock, 162,066 shares as of March 31, 2023 and December 31, 2022.	(500)	(500)
Total shareholders' equity	22,596	23,795
Total liabilities and shareholders' equity	$ 73,057	$ 73,107