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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Operating activities:    
Net income $ 4,033 $ 975
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 6,152 3,294
Amortization of intangible assets 430 0
Asset retirement obligation settlement (1,235) (1,249)
(Gain) loss on disposal of assets (25) 0
Amortization of deferred financing cost 63 60
Accretion of debt discount 145 56
Deferred income taxes 318 307
Stock-based compensation, net 790 610
Employee stock purchase plan compensation 9 0
Change in contingent consideration fair value (967) 0
Changes in assets and liabilities, net of effects of acquisitions:    
Accounts receivable (12,445) (4,314)
Unbilled receivables (258) 986
Inventories 5,004 3,820
Prepaid expenses and other assets 1,129 (3,586)
Deferred revenue 909 872
Accounts payable (2,501) (7,587)
Accrued and other expenses 4,772 4,144
Net cash provided by (used in) operating activities 6,323 (1,612)
Investing activities:    
Purchases of property, plant and equipment (8,499) (46,869)
Net cash used in investing activities (8,499) (46,869)
Financing activities:    
Proceeds from the issuance of notes payable 2,021 0
Repayments of notes payable (407) 0
Payments under equipment financing obligations (22) (70)
Payment of deferred financing and debt issuance costs (830) 0
Proceeds from revolving credit facility 13,500 16,000
Repayment of revolving credit facility (10,500) 0
Payment of contingent consideration (700) 0
Proceeds from equity issuance 40 0
Purchase of treasury stock (23) (54)
Net cash provided by financing activities 3,079 15,876
Effect of exchange rate changes on cash, cash equivalents and restricted cash 0 0
Net increase (decrease) in cash, cash equivalents and restricted cash 903 (32,605)
Cash and cash equivalents and restricted cash at beginning of year 1,466 35,227
Cash and cash equivalents and restricted cash at end of period 2,369 2,622
Non-cash financing activities:    
Capitalized expenditures in accounts payable and accrued expenses $ 2,285 $ 11,488