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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating activities:      
Net income $ 18,688,000 $ 21,526,000 $ 10,379,000
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and accretion of asset retirement obligation 17,159,000 7,926,000 6,481,000
Goodwill and indefinite-lived intangible asset impairment 17,835,000 0 0
Amortization of intangible assets 1,002,000 0 0
Asset retirement obligation settlement (3,180,000) 0 0
Loss (gain) on disposal of assets 321,000 253,000 (54,000)
Loss on extinguishment of debt 0 0 1,051,000
Provision for bad debt 42,000 0 0
Amortization of deferred financing cost 300,000 455,000 159,000
Accretion of debt discount 246,000 0 263,000
Deferred income taxes 4,659,000 (1,805,000) 539,000
Stock-based compensation, net 2,937,000 2,012,000 1,426,000
Employee stock purchase plan compensation 72,000 0 0
Non-cash interest expense on Series A preferred stock 0 0 5,565,000
Change in estimated fair value of contingent consideration (1,858,000) 0 0
Changes in assets and liabilities:      
Accounts receivable 4,457,000 (18,038,000) (3,319,000)
Unbilled receivables (6,631,000) (788,000) 3,617,000
Inventories (7,343,000) 4,407,000 (1,357,000)
Prepaid expenses and other assets (1,761,000) (3,394,000) 133,000
Deferred revenue 4,095,000 (1,615,000) (5,518,000)
Accounts payable (2,271,000) 9,356,000 761,000
Accrued and other expenses 2,140,000 2,391,000 (481,000)
Income taxes payable 0 (7,058,000) 7,058,000
Net cash provided by operating activities 50,909,000 15,628,000 26,703,000
Investing activities:      
Acquisition of businesses, net of cash acquired (29,921,000) 0 0
Purchases of property, plant and equipment (96,090,000) (51,162,000) (2,519,000)
Proceeds from disposal of assets 22,000 14,000 49,000
Net cash used in investing activities (125,989,000) (51,148,000) (2,470,000)
Financing activities:      
Repayment of line of credit 0 0 (1,368,000)
Repayments of notes payable (559,000) (282,000) 0
Payments under equipment financing obligations (168,000) (353,000) (409,000)
Payment of deferred financing and debt issuance costs (233,000) (193,000) (1,178,000)
Proceeds from revolving credit facility 84,000,000 0 1,100,000
Repayment of revolving credit facility (39,500,000) 0 (65,316,000)
Payment of contingent consideration (175,000) 0 0
Proceeds from equity issuance 127,000 26,251,000 138,371,000
Payment of equity transaction costs 0 (2,083,000) (11,047,000)
Repayment of Series A preferred stock 0 0 (40,328,000)
Purchase of treasury stock (2,173,000) (127,000) (420,000)
Net cash provided by financing activities 41,319,000 23,213,000 19,405,000
Effect of exchange rate changes on cash, cash equivalents and restricted cash 0 0 0
Net increase (decrease) in cash, cash equivalents and restricted cash (33,761,000) (12,307,000) 43,638,000
Cash and cash equivalents and restricted cash at beginning of year 35,227,000 47,534,000 3,896,000
Cash and cash equivalents and restricted cash at end of year $ 1,466,000 $ 35,227,000 $ 47,534,000