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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 41,371 $ 40,955
Restricted cash 5,000 5,000
Short-term investments 583 583
Accounts receivable, net of allowance for doubtful accounts of $250 at December 31, 2020 and 2019 5,137 7,343
Prepaid expenses and other current assets 3,083 4,709
Total current assets 55,174 58,590
Property and equipment, net 35,409 38,900
Right-of-use assets 5,241 5,494
Intangibles, net 398 393
Total assets 96,222 103,377
Current liabilities:    
Accounts payable 1,434 1,603
Accrued liabilities:    
Payroll costs and other taxes 1,011 1,045
Other 1,375 1,811
Deferred revenue 0 1,779
Current maturities of notes payable and finance leases 551 94
Current maturities of operating lease liabilities 1,089 1,109
Total current liabilities 5,460 7,441
Long-term liabilities:    
Notes payable and finance leases, net of current maturities 36 44
Operating lease liabilities, net of current maturities 4,659 4,899
Deferred tax liabilities, net 19 19
Total long-term liabilities 4,714 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, 23,526,517 shares issued and 23,478,072 shares outstanding at March 31, 2021 and December 31, 2020 235 235
Additional paid-in capital 154,967 154,866
Retained deficit (68,155) (62,927)
Treasury stock, at cost; 48,445 shares
Accumulated other comprehensive loss, net (999) (1,200)
Total stockholders' equity 86,048 90,974
Total liabilities and stockholders' equity $ 96,222 $ 103,377