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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 25,376 $ 40,955
Restricted cash 5,000 5,000
Short-term investments 265 583
Accounts receivable, net of allowance for doubtful accounts of $250 at December 31, 2021 and 2020 8,905 7,343
Prepaid expenses and other current assets 3,313 4,709
Total current assets 42,859 58,590
Property and equipment 253,066 271,480
Less accumulated depreciation (226,717) (232,580)
Property and equipment, net 26,349 38,900
Right-of-use assets 4,435 5,494
Intangibles, net 395 393
Total assets 74,038 103,377
Current liabilities:    
Accounts payable 2,580 1,603
Accrued liabilities:    
Payroll costs and other taxes 1,066 1,045
Other 1,338 1,811
Deferred revenue 1,344 1,779
Current maturities of notes payable and finance leases 302 94
Current maturities of operating lease liabilities 961 1,109
Total current liabilities 7,591 7,441
Long-term liabilities:    
Notes payable and finance leases, net of current maturities 8 44
Operating lease liabilities, net of current maturities 3,942 4,899
Deferred tax liabilities, net 20 19
Total long-term liabilities 3,970 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 December 31, 2021 and December 31, 2020, respectively 237 235
Additional paid-in capital 155,268 154,866
Retained deficit (92,018) (62,927)
Treasury stock, at cost; 48,445 shares
Accumulated other comprehensive loss, net (1,010) (1,200)
Total stockholders' equity 62,477 90,974
Total liabilities and stockholders' equity $ 74,038 $ 103,377