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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Current assets:    
Cash and cash equivalents $ 39,278 $ 11,725
Accounts receivable 10,371 69,720
Unbilled receivables 1,220 127
Inventory 15,937 19,136
Prepaid expenses and other current assets 14,860 11,378
Total current assets 81,666 112,086
Property, plant and equipment, net 268,417 274,676
Operating lease right-of-use assets 29,028 32,099
Intangible assets, net 7,857 8,253
Other assets 490 563
Total assets 387,458 427,677
Current liabilities:    
Accounts payable 4,942 3,268
Accrued expenses and other liabilities 10,037 13,142
Deferred revenue, current 4,827 6,875
Long-term debt, net, current 7,177 6,901
Operating lease liabilities, current 7,602 7,077
Total current liabilities 34,585 37,263
Deferred revenue, net 6,984 3,482
Long-term debt, net 18,826 22,445
Operating lease liabilities, long-term 24,497 27,020
Deferred tax liabilities, long-term, net 27,141 32,981
Asset retirement obligation 16,108 14,996
Contingent consideration 0 180
Other Liabilities, Noncurrent 505 503
Total liabilities 128,646 138,870
Commitments and contingencies (Note 15)
Stockholders’ equity    
Common stock, $0.001 par value, 350,000,000 shares authorized; 43,547,924 issued and 41,832,789 outstanding at June 30, 2021; 43,193,394 issued and 41,575,129 outstanding at December 31, 2020 42 42
Treasury stock, at cost, 1,715,135 and 1,618,265 shares at June 30, 2021 and December 31, 2020, respectively (4,422) (4,134)
Additional paid-in capital 172,512 171,209
Retained earnings 90,088 121,267
Accumulated other comprehensive income 592 423
Total stockholders’ equity 258,812 288,807
Total liabilities and stockholders’ equity $ 387,458 $ 427,677