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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating activities:      
Net income $ 21,526 $ 10,379 $ 4,990
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization of asset retirement obligation 7,926 6,481 5,318
(Gain) loss on disposal of assets 253 (59) 54
Loss on derivatives   5 455
Loss on extinguishment of debt   1,051  
Revenue reserve     (92)
Amortization of deferred financing cost 455 159 251
Accretion of debt discount   263 519
Deferred income taxes (1,805) 539 3,700
Stock-based compensation, net 2,012 1,426 792
Non-cash interest expense on revolving credit facility     706
Non-cash interest expense on Series A preferred stock   5,565 5,078
Changes in assets and liabilities:      
Accounts Receivable (18,038) (3,319) 2,629
Unbilled Receivables (788) 3,617  
Inventories 4,407 (1,357) (2,462)
Prepaid expenses and other assets (3,394) 133 2,423
Deferred revenue (1,615) (5,518) 7,133
Accounts payable 9,356 761 (137)
Accrued and other expenses 2,391 (481) (654)
Income taxes payable (7,058) 7,058  
Net cash provided by operating activities 15,628 26,703 30,703
Investing activities:      
Purchases of property, plant and equipment (51,162) (2,519) (29,375)
Proceeds from disposal of assets 14 49  
Net cash used in investing activities (51,148) (2,470) (29,375)
Financing activities:      
Repayment of line of credit   (1,368) (456)
Repayments of notes payable (282)    
Payments under equipment financing obligations (353) (409) (390)
Payment of deferred financing and amendment costs (193) (1,178) (415)
Proceeds from revolving credit facility   1,100 12,800
Repayment of revolving credit facility   (65,316) (9,647)
Proceeds from equity issuance 26,251 138,371  
Payment of equity transaction costs (2,083) (11,047)  
Repayment of Series A preferred stock   (40,328)  
Cash dividend on Series A preferred stock   (4) (5)
Purchase of treasury stock (127) (416) (121)
Net cash provided by financing activities 23,213 19,405 1,766
Net increase (decrease) in cash, cash equivalents and restricted cash (12,307) 43,638 3,094
Cash and cash equivalents and restricted cash at beginning of year 47,534 3,896 802
Cash and cash equivalents and restricted cash at end of year 35,227 47,534 3,896
Supplemental disclosure of cash flow information      
Cash paid for interest 251 3,369 2,270
Cash paid for taxes 7,664 933 (1,093)
Non-cash investing and financing activities:      
Asset retirement obligation 7,084 (188) (614)
Equipment purchased with debt     1,982
Leasehold improvements funded by landlord 787    
Capitalized non-cash interest into property, plant and equipment   139 1,808
Capitalized expenditures in accounts payable and accrued expenses $ 17,477 $ 48 $ 3,113