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Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets    
Cash and cash equivalents $ 11,700 $ 6,533
Accounts receivable 250 32
Lease receivable, current portion 821 0
Inventory 333 1,091
Assets held for sale 3,179 0
Prepaid expenses and other current assets 309 702
Total current assets 16,592 8,358
Non-current assets    
Property and equipment, net 1,822 24,883
Intellectual property, net 685 819
Investment in LINICO 1,500 0
Lease receivable, non-current portion 15,811 0
Other assets 917 1,078
Total non-current assets 20,735 26,780
Total assets 37,327 35,138
Current liabilities    
Accounts payable 1,063 1,552
Accrued expenses 4,705 1,253
Lease liability, current portion 501 620
Notes payable, current portion 0 29
Total current liabilities 6,269 3,454
Lease liability, non-current portion 269 242
Notes payable, non-current portion 0 303
Total liabilities 6,538 3,999
Commitments and contingencies
Stockholders’ equity    
Common stock; $0.001 par value; 100,000,000 shares authorized; 69,823,664 and 64,461,065 shares issued and outstanding as of September 30, 2021 and December 31, 2020, respectively 70 64
Additional paid-in capital 209,860 196,728
Accumulated deficit (179,141) (165,653)
Total stockholders’ equity 30,789 31,139
Total liabilities and stockholders’ equity $ 37,327 $ 35,138