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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Operating activities:    
Net loss $ (3,912) $ (84)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 6,375 5,363
Amortization of intangible assets 198 199
Loss on disposal of assets 2 0
Amortization of deferred financing cost 26 26
Accretion of debt discount 47 45
Deferred income taxes (7,691) 1,264
Stock-based compensation, net 678 1,025
Employee stock purchase plan compensation 7 13
Change in contingent consideration fair value 0 (1,020)
Changes in assets and liabilities:    
Accounts receivable 3,062 1,095
Unbilled receivables (88) 4,536
Inventories 1,590 3,642
Prepaid expenses and other assets 1,140 (1,933)
Deferred revenue 2,191 (2,575)
Accounts payable 1,332 2,048
Accrued and other expenses (1,043) (1,471)
Income taxes payable 0 (112)
Net cash provided by operating activities 3,914 12,061
Investing activities:    
Purchases of property, plant and equipment (2,213) (4,185)
Proceeds from disposal of assets (2) 0
Net cash used in investing activities (2,215) (4,185)
Financing activities:    
Repayments of notes payable (1,672) (1,192)
Payments under equipment financing obligations (31) (32)
Payment of deferred financing and debt issuance costs 0 (20)
Proceeds from revolving credit facility 0 6,000
Repayment of revolving credit facility 0 (2,500)
Payment of contingent consideration (180) (280)
Proceeds from equity issuance 17 46
Purchase of treasury stock (141) (1,014)
Net cash (used in) provided by financing activities (2,007) 1,008
Net increase in cash and cash equivalents (308) 8,884
Cash and cash equivalents at beginning of year 11,725 2,639
Cash and cash equivalents at end of period 11,417 11,523
Noncash Investing and Financing Items [Abstract]    
Asset retirement obligation 737 0
Capitalized expenditures in accounts payable and accrued expenses 1,097 1,269
Stock Issued $ 20 $ 0