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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Current assets    
Cash and cash equivalents $ 8,130 $ 10,777
Restricted cash 5 5
Marketable securities 2,335 0
Accounts receivable, net 1,300 1,080
Inventories 799 814
Prepaid expenses and other current assets 388 391
Total current assets 12,957 13,067
Property, plant and equipment, net 290 338
Intangible assets, net 116 131
Right-of-use assets 119 163
Deferred tax assets 8 8
Other assets 42 72
Total assets 13,532 13,779
Current liabilities    
Accounts payable 333 338
Accrued liabilities 251 507
Lease liabilities, current 114 138
Accrued income taxes 66 54
Total current liabilities 764 1,037
Long-term liabilities    
Lease liabilities, long term 14 37
Total long-term liabilities 14 37
Total liabilities 778 1,074
Commitments and contingencies (Note 8)
Stockholders' equity    
Preferred stock, $0.01 par value: 1,000 shares authorized, 200 shares of Series A Convertible Preferred Stock issued and outstanding at both March 31, 2022 and December 31, 2021 ($5.0 million liquidation preference) 2 2
Common stock, $0.001 par value: 30,000 shares authorized, 6,602 shares issued and outstanding at both March 31, 2022 and December 31, 2021 7 7
Additional paid-in-capital 62,552 62,552
Accumulated other comprehensive income 103 96
Accumulated deficit (49,910) (49,952)
Total stockholders' equity 12,754 12,705
Total liabilities and stockholders' equity $ 13,532 $ 13,779