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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Operating activities:    
Net loss $ (3,330) $ (38,441)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 19,904 18,937
Amortization of intangible assets 596 596
(Gain) loss on disposal of assets (482) 223
Bad debt expense 1 19,592
Amortization of deferred financing cost 79 79
Accretion of debt discount 140 140
Deferred income taxes (2,784) (7,543)
Stock-based compensation, net 2,436 2,131
Employee stock purchase plan compensation 18 24
Changes in assets and liabilities:    
Accounts receivable (14,238) 34,791
Unbilled receivables (593) (1,113)
Inventory (5,594) 3,755
Prepaid expenses and other assets 3,072 (1,886)
Deferred revenue (6,365) 6,092
Accounts payable 2,784 1,564
Accrued and other expenses 4,187 (1,397)
Net cash (used in) provided by operating activities (169) 37,544
Investing activities:    
Acquisition of Blair facility (6,547) 0
Purchases of property, plant and equipment (9,535) (6,976)
Proceeds from disposal of assets 995 78
Net cash used in investing activities (15,087) (6,898)
Financing activities:    
Repayments of notes payable (5,474) (5,168)
Payments under finance leases (88) (92)
Proceeds from revolving credit facility 6,000 0
Payment of contingent consideration 0 (180)
Employee stock purchase plan issuance 52 42
Purchase of treasury stock (451) (294)
Net cash provided by (used in) financing activities 39 (5,692)
Net decrease in cash and cash equivalents (15,217) 24,954
Cash and cash equivalents at beginning of year 25,588 11,725
Cash and cash equivalents at end of period 10,371 36,679
Noncash Investing and Financing Items [Abstract]    
Purchases of property, plant and equipment in accounts payable and accrued expenses 685 267
Issuance of acquisition common stock 0 0
Additions to asset retirement obligations $ 8,281 $ 737