Consolidated Balance Sheets - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 5,724 $ 8,315
Restricted cash 806 2,111
Accounts receivable, net 4,488 5,314
Account receivable-due from government awards 292 1,013
Unbilled accounts receivable 1,102 253
Inventories 7,632 8,379
Prepaid expenses and other current assets 691 943
Total current assets 20,735 26,328
Property, plant and equipment, net 30,483 21,132
Operating lease right-of-use assets 113 50
Intangibles and other assets 37 126
Total assets 51,368 47,636
Current liabilities:    
Accounts payable 1,348 1,206
Accrued compensation 1,664 1,628
Paycheck Protection Program loan - current   982
Revolving credit facility, net 1,974 1,875
Common stock warrant liability 1,374 4,622
Other accrued expenses 722 1,693
Deferred revenue 54 425
Operating lease liability - current 60 51
Finance lease liability - current 1,133 1,027
Other current liabilities 608 757
Total current liabilities 8,937 14,266
Other liability - long term 28 56
Paycheck Protection Program loan - long term   982
Deferred Income - government awards - long term 12,458 4,309
Operating lease liability - long term 54  
Finance lease liability - long term 11,647 11,783
Total liabilities 33,124 31,396
Commitments and contingencies (Note 15)
Shareholders' equity:    
Preferred stock, $.001 par value: authorized 10,000,000 shares: Series B Convertible Preferred stock, (liquidation preference of $5,659) stated value $1,000 per share, $0.001 par value: 10,000 shares designated and 5,659 issued and outstanding as of December 31, 2021 and December 31, 2020.
Common stock, $0.001 par value: authorized 200,000,000 shares, issued 72,931,490 shares, outstanding 72,769,424 shares as of December 31, 2021 and issued 68,890,819 shares, outstanding 68,728,753 shares as of December 31, 2020. 72 69
Additional paid-in capital 275,936 268,729
Accumulated deficit (257,264) (252,058)
Treasury stock, 162,066 shares as of December 31, 2021 and December 31, 2020. (500) (500)
Total shareholders' equity 18,244 16,240
Total liabilities and shareholders' equity $ 51,368 $ 47,636