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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 25,588 $ 11,725
Accounts receivable 17,481 69,720
Unbilled receivables 1,884 127
Inventory 15,024 19,136
Prepaid expenses and other current assets 13,886 11,378
Total current assets 73,863 112,086
Property, plant and equipment, net 262,465 274,676
Operating lease right-of-use assets 29,828 32,099
Intangible assets, net 7,461 8,253
Other assets 402 563
Total assets 374,019 427,677
Current liabilities:    
Accounts payable 8,479 3,268
Deferred revenue, current 9,842 6,875
Long-term debt, net, current 7,127 6,901
Operating lease liabilities, current 9,029 7,077
Total current liabilities 48,550 37,263
Deferred revenue, net 6,428 3,482
Long-term debt, net 15,353 22,445
Operating lease liabilities, long-term 23,690 27,020
Deferred tax liabilities, long-term, net 22,434 32,981
Asset retirement obligation 16,155 14,996
Contingent consideration 0 180
Other non-current liabilities 249 503
Total liabilities 132,859 138,870
Commitments and contingencies (Note 18)
Stockholders’ equity    
Common stock, $0.001 par value, 350,000,000 shares authorized; 43,567,743    issued and 41,790,742 outstanding at December 31, 2021; 43,193,394    issued and 41,575,129 outstanding at December 31, 2020 42 42
Treasury stock, at cost, 1,777,001 and 1,618,265 shares at    December 31, 2021 and 2020, respectively (4,535) (4,134)
Additional paid-in capital 174,486 171,209
Retained earnings 70,593 121,267
Accumulated other comprehensive income 574 423
Total stockholders’ equity 241,160 288,807
Total liabilities and stockholders’ equity 374,019 427,677
Total accrued liabilities $ 14,073 $ 13,142