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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Current assets:    
Cash and cash equivalents $ 10,371 $ 25,588
Accounts receivable 32,902 17,481
Unbilled receivables 1,292 1,884
Inventory 20,618 15,024
Prepaid expenses and other current assets 7,405 13,886
Total current assets 72,588 73,863
Property, plant and equipment, net 267,210 262,465
Operating lease right-of-use assets 28,418 29,828
Intangible assets, net 6,867 7,461
Other assets 315 402
Total assets 375,398 374,019
Current liabilities:    
Accounts payable 11,634 8,479
Accrued expenses and other liabilities 16,267 14,073
Current portion of deferred revenue 9,905 9,842
Current portion of long-term debt 6,495 7,127
Current portion of operating lease liabilities 10,560 9,029
Total current liabilities 54,861 48,550
Long-term deferred revenue 0 6,428
Long-term debt 16,289 15,353
Long-term operating lease liabilities 19,989 23,690
Deferred tax liabilities, long-term, net 19,650 22,434
Asset retirement obligation 25,006 16,155
Other Liabilities, Noncurrent 42 249
Total liabilities 135,837 132,859
Commitments and contingencies (Note 15)
Stockholders’ equity    
Treasury stock, at cost, 1,959,668 and 1,777,001 shares at September 30, 2022 and December 31, 2021, respectively 42 42
Treasury stock, at cost, 1,959,668 and 1,777,001 shares at September 30, 2022 and December 31, 2021, respectively (4,986) (4,535)
Additional paid-in capital 176,992 174,486
Retained earnings 67,263 70,593
Accumulated other comprehensive income 250 574
Total stockholders’ equity 239,561 241,160
Total liabilities and stockholders’ equity $ 375,398 $ 374,019