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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities:    
Net income $ 975 $ 969
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 3,294 1,687
Asset retirement obligation settlement (1,249) 0
(Gain) on disposal of assets 0 (37)
Amortization of deferred financing cost 60 106
Accretion of debt discount 56 0
Deferred income taxes 307 324
Stock-based compensation 610 176
Changes in assets and liabilities:    
Accounts receivable (4,314) (4,101)
Unbilled receivables 986 (953)
Inventories 3,820 4,308
Prepaid expenses and other assets (3,586) (181)
Deferred revenue 872 (1,615)
Accounts payable (7,587) 77
Accrued and other expenses 4,144 2,893
Income taxes payable 0 191
Net cash (used in) provided by operating activities (1,612) 3,844
Investing activities:    
Purchases of property, plant and equipment (46,869) (1,623)
Proceeds from disposal of assets 0 14
Net cash used in investing activities (46,869) (1,609)
Financing activities:    
Repayments of notes payable 0 (4)
Payments under equipment financing obligations (70) (102)
Payment of deferred financing costs 0 (188)
Proceeds from revolving credit facility 16,000 0
Proceeds from equity issuance 0 26,251
Payment of equity transaction costs 0 (2,083)
Purchase of treasury stock (54) 0
Net cash provided by financing activities 15,876 23,874
Net (decrease) increase in cash, cash equivalents and restricted cash (32,605) 26,109
Cash and cash equivalents and restricted cash at beginning of year 35,227 47,534
Cash and cash equivalents and restricted cash at end of period 2,622 73,643
Supplemental disclosure of cash flow information    
Cash paid for interest 95 15
Cash paid for taxes 207 29
Non-cash investing activities:    
Asset retirement obligation 250 0
Non-cash financing activities:    
Capitalized expenditures in accounts payable and accrued expenses $ 11,488 $ 500