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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Current assets:    
Cash and cash equivalents $ 4,698 $ 25,588
Accounts receivable 26,661 17,481
Unbilled receivables 1,515 1,884
Inventory 13,583 15,024
Prepaid expenses and other current assets 9,668 13,886
Total current assets 56,125 73,863
Property, plant and equipment, net 273,312 262,465
Operating lease right-of-use assets 29,506 29,828
Intangible assets, net 7,263 7,461
Other assets 364 402
Total assets 366,570 374,019
Current liabilities:    
Accounts payable 7,534 8,479
Accrued expenses and other liabilities 12,599 14,073
Deferred revenue, current 11,470 9,842
Long-term debt, net, current 7,171 7,127
Operating lease liabilities, current 9,426 9,029
Total current liabilities 48,200 48,550
Deferred revenue, net 3,627 6,428
Long-term debt, net 13,258 15,353
Operating lease liabilities, long-term 22,576 23,690
Deferred tax liabilities, long-term, net 18,259 22,434
Asset retirement obligation 24,626 16,155
Other Liabilities, Noncurrent 42 249
Total liabilities 130,588 132,859
Commitments and contingencies (Note 14)
Stockholders’ equity    
Treasury stock, at cost, 1,833,401 and 1,777,001 shares at March 31, 2022 and December 31, 2021, respectively 42 42
Treasury stock, at cost, 1,833,401 and 1,777,001 shares at March 31, 2022 and December 31, 2021, respectively (4,662) (4,535)
Additional paid-in capital 175,342 174,486
Retained earnings 64,670 70,593
Accumulated other comprehensive (loss) income 590 574
Total stockholders’ equity 235,982 241,160
Total liabilities and stockholders’ equity $ 366,570 $ 374,019
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 350,000,000 350,000,000
Common stock, shares issued (in shares) 43,935,779 43,567,743
Common stock, shares outstanding (in shares) 42,102,378 41,962,863
Treasury stock, shares (in shares) 1,833,401 1,777,001