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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 36,018 $ 40,955
Restricted cash 5,000 5,000
Short-term investments 583 583
Accounts receivable, net 325 7,343
Prepaid expenses and other current assets 2,516 4,709
Total current assets 44,442 58,590
Property and equipment, net 28,941 38,900
Right-of-use assets 4,703 5,494
Intangibles, net 394 393
Total assets 78,480 103,377
Current liabilities:    
Accounts payable 1,557 1,603
Accrued liabilities:    
Payroll costs and other taxes 672 1,045
Other 1,491 1,811
Deferred revenue 96 1,779
Current maturities of notes payable and finance leases 246 94
Current maturities of operating lease liabilities 1,006 1,109
Total current liabilities 5,068 7,441
Long-term liabilities:    
Notes payable and finance leases, net of current maturities 10 44
Operating lease liabilities, net of current maturities 4,177 4,899
Deferred tax liabilities, net 19 19
Total long-term liabilities 4,206 4,962
Operating commitments and contingencies
Stockholders' equity:    
Preferred stock-par value $1.00 per share; 4,000,000 shares authorized, none outstanding
Common stock-par value $0.01 per share; 35,000,000 shares authorized, 23,692,379 and 23,526,517 shares issued, and 23,643,934 and 23,478,072 shares outstanding at September 30, 2021 and December 31, 2020, respectively 237 235
Additional paid-in capital 155,101 154,866
Retained deficit (85,037) (62,927)
Treasury stock, at cost; 48,445 shares
Accumulated other comprehensive loss, net (1,095) (1,200)
Total stockholders' equity 69,206 90,974
Total liabilities and stockholders' equity $ 78,480 $ 103,377