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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 23,405 $ 28,729
Short-term investments 10,583 10,583
Accounts receivable, net 35,661 25,338
Current maturities of notes receivable 64 64
Prepaid expenses and other current assets 9,134 12,311
Total current assets 78,847 77,025
Property and equipment, net 66,696 71,541
Right-of-use assets 7,531  
Notes receivable, net of current maturities 1,434 1,447
Intangibles, net 374 379
Long-term deferred tax assets, net 290 293
Total assets 155,172 150,685
Current liabilities:    
Accounts payable 7,103 5,427
Accrued liabilities:    
Payroll costs and other taxes 2,054 1,034
Other 3,404 3,643
Deferred revenue 5,675 10,501
Current maturities of notes payable and finance leases 6,459 6,683
Current maturities of operating lease liabilities 1,229  
Total current liabilities 25,924 27,288
Long-term liabilities:    
Notes payable and finance leases, net of current maturities 4,861 6,097
Operating lease liabilities, net of current maturities 6,839  
Deferred tax liabilities, net 146 134
Other accrued liabilities 150 150
Total long-term liabilities 11,996 6,381
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, 23,219,484 and 23,018,441 shares issued, and 23,171,039 and 22,969,996 shares outstanding at March 31, 2019 and December 31, 2018, respectively 232 230
Additional paid-in capital 153,430 153,268
Retained deficit (34,655) (34,518)
Treasury stock, at cost; 48,445 shares
Accumulated other comprehensive loss, net (1,755) (1,964)
Total stockholders' equity 117,252 117,016
Total liabilities and stockholders' equity $ 155,172 $ 150,685