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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 13,823 $ 17,299
Short-term investments 0 11,698
Restricted cash 499 393
Accounts receivable 0 4,887
Inventory 0 1,383
Prepaid expenses and other current assets 859 3,930
Total current assets 15,181 39,590
Non-current restricted cash 99 597
Land, buildings, and equipment 21,731 22,860
Other non-current assets 183 280
Total assets 37,194 63,327
Current liabilities:    
Accounts payable 1,260 929
Accrued expenses 339 2,891
Accrued compensation 2,522 1,950
Due to related parties 172 766
Current portion of financing lease obligations 370 364
Other current liabilities 191 45
Total current liabilities 4,854 6,945
Financing lease obligations 17,506 17,876
Long-term debt 0 1,518
Other non-current liabilities 702 113
Total liabilities 23,062 26,452
Stockholders’ equity:    
Common stock, $0.0001 par value; 275,000,000 shares authorized; 37,165,196 shares issued and 37,065,044 shares outstanding as of December 31, 2020 and 33,033,689 shares issued and 32,951,329 shares outstanding as of December 31, 2019 4 4
Additional paid-in capital 211,263 204,807
Common stock in treasury, at cost, 100,152 shares as of December 31, 2020 and 82,360 as of December 31, 2019 (1,043) (1,043)
Accumulated deficit (196,092) (166,893)
Total stockholders’ equity 14,132 36,875
Total liabilities and stockholders’ equity $ 37,194 $ 63,327