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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Operating activities:    
Net loss $ (6,013) $ (31,179)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 13,206 12,604
Amortization of intangible assets 398 398
Gain on disposal of assets (16) (58)
Bad debt expense 1 19,592
Amortization of deferred financing cost 53 53
Accretion of debt discount 93 93
Deferred income taxes (3,264) (5,839)
Stock-based compensation, net 1,628 1,252
Employee stock purchase plan compensation 11 14
Changes in assets and liabilities:    
Accounts receivable (10,974) 39,756
Unbilled receivables (6,635) (1,094)
Inventory (1,850) 3,199
Prepaid expenses and other assets 1,854 (2,391)
Deferred revenue (4,542) 1,215
Accounts payable 3,229 1,698
Accrued and other expenses 1,872 (2,833)
Net cash (used in) provided by operating activities (10,949) 36,480
Investing activities:    
Acquisition of Blair facility (6,547) 0
Purchases of property, plant and equipment (5,137) (5,043)
Proceeds from disposal of assets 0 2
Net cash used in investing activities (11,684) (5,041)
Financing activities:    
Repayments of notes payable (3,581) (3,370)
Payments under finance leases (60) (65)
Proceeds from revolving credit facility 3,000 0
Payment of contingent consideration 0 (180)
Employee stock purchase plan issuance 25 17
Purchase of treasury stock (241) (288)
Net cash used in financing activities (857) (3,886)
Net decrease in cash and cash equivalents (23,490) 27,553
Cash and cash equivalents at beginning of year 25,588 11,725
Cash and cash equivalents at end of period 2,098 39,278
Noncash Investing and Financing Items [Abstract]    
Capitalized expenditures in accounts payable and accrued expenses 927 172
Issuance of acquisition common stock 0 20
Asset retirement obligation $ 8,281 $ 737