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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Operating activities:        
Net (loss) income $ (2,062) $ 2,725 $ 4,990 $ 7,556
Adjustments to reconcile net (loss) income to net cash provided by operating activities:        
Depreciation, depletion and amortization of asset retirement obligation 4,893 3,760 5,318 3,642
(Gain) loss on disposal of assets (59) 45 54 57
Loss on derivatives 5 394 455  
Loss on extinguishment of debt       1,230
Revenue reserve   (92) (92)  
Bad debt expense 189      
Amortization of deferred financing cost 117 107 251 86
Accretion of debt discount 232 217 519 183
Deferred income taxes (4,708) (757) 3,700 8,378
Stock-based compensation 720 611 792 418
Non-cash interest expense on revolving credit facility   706 706 1,852
Non-cash interest expense on Redeemable Series A preferred stock 4,936 3,690 5,078 5,601
Changes in assets and liabilities:        
Accounts and unbilled receivables     2,629 (4,367)
Accounts receivables (903) 5,667    
Unbilled receivables 3,909 120    
Inventories (963) (1,549) (2,462) 316
Prepaid expenses and other current assets 242 2,242 2,423 (3,492)
Deferred revenue (1,929)   7,133 (183)
Accounts payable (368) (343) (137) 759
Accrued and other expenses 280 (82) (654) 272
Income taxes payable 3,568 189   (171)
Net cash provided by operating activities 8,099 17,650 30,703 22,137
Investing activities:        
Purchases of property, plant and equipment (2,058) (26,899) (29,375) (30,888)
Proceeds from disposal of assets 108      
Net cash used in investing activities (1,950) (26,899) (29,375) (30,888)
Financing activities:        
Repayment of line of credit       (9,230)
Repayments of notes payable (1,259) (326) (456) (139)
Payments under equipment financing obligations (299) (285) (390) (231)
Payment of deferred financing and amendment costs 2 (78) (415) (659)
Proceeds from revolving credit facility   12,000 12,800 61,199
Repayment of revolving credit facility (7,716) (2,647) (9,647) (3,500)
Repayment of Series A preferred stock       (39,999)
Cash dividend on Redeemable Series A preferred stock (3) (2) (5) (5)
Purchase of treasury stock (57) (121) (121) (2)
Net cash (used in) provided by financing activities (9,332) 8,541 1,766 7,434
Net (decrease) increase in cash (3,183) (708) 3,094 (1,317)
Cash at beginning of period 3,896 802 802 2,119
Cash at end of period 713 94 3,896 802
Non-cash investing and financing activities:        
Asset retirement obligation     (614) 1,544
Equipment purchased with debt   1,080 1,982 180
Equipment purchased under equipment financing obligations       2,217
Capitalized non-cash interest into property, plant and equipment     1,808 453
Debt issuance costs netted against proceeds       1,414
Capitalized expenditures in accounts payable and accrued expenses 254 5,204 3,113 4,386
Supplemental disclosure of cash flow information:        
Cash paid for interest 2,344 1,140 2,270 2,782
Cash paid for taxes, net     $ (1,093) $ 3,542
Cash paid for taxes $ 218 $ 369