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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 2,098 $ 1,466
Accounts receivable, net 58,749 18,989
Unbilled receivables 1,189 7,823
Inventories 15,926 18,575
Prepaid expenses and other current assets 1,092 3,243
Total current assets 79,054 50,096
Property, plant and equipment, net 250,486 248,396
Operating lease right-of-use assets 29,702 0
Intangible assets, net 9,244 18,068
Other assets 3,537 3,732
Total assets 372,023 320,292
Current liabilities:    
Accounts payable 10,039 11,336
Accrued and other expenses 10,234 8,392
Deferred revenue 5,545 4,095
Current portion of long-term debt 23,940 829
Operating lease liabilities, current portion 11,799 0
Total current liabilities 61,557 24,652
Deferred revenue, net of current portion 2,946 0
Long-term debt, net of current portion 6,791 47,893
Operating lease liabilities, long-term, net of current portion 17,397 0
Long-term deferred tax liabilities, net 24,685 17,898
Asset retirement obligation 14,897 13,322
Contingent consideration 2,800 7,167
Total liabilities 131,073 110,932
Commitments and contingencies (Note 16)
Stockholders’ equity    
Common stock, $0.001 par value, 350,000,000 shares authorized; 40,974,470 issued and 40,233,850 outstanding at September 30, 2019; 40,673,513 issued and 39,974,478 outstanding at December 31, 2018 40 40
Treasury stock, at cost, 740,620 and 699,035 shares at September 30, 2019 and December 31, 2018, respectively (2,978) (2,839)
Additional paid-in capital 164,499 162,195
Retained earnings 79,512 50,277
Accumulated other comprehensive loss (123) (313)
Total stockholders’ equity 240,950 209,360
Total liabilities and stockholders’ equity $ 372,023 $ 320,292