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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Operating activities:    
Net loss $ (5,923) $ (3,912)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:    
Depreciation, depletion and accretion of asset retirement obligation 6,568 6,375
Amortization of intangible assets 199 198
Loss on disposal of assets 0 2
Amortization of deferred financing cost 26 26
Accretion of debt discount 47 47
Deferred income taxes (4,175) (7,691)
Stock-based compensation, net 826 678
Employee stock purchase plan compensation 5 7
Changes in assets and liabilities:    
Accounts receivable (5,411) 3,062
Unbilled receivables (3,399) (88)
Inventory 1,441 1,590
Prepaid expenses and other assets 3,835 1,140
Deferred revenue (1,173) 2,191
Accounts payable (193) 1,332
Accrued and other expenses (1,335) (1,043)
Net cash (used in) provided by operating activities (8,662) 3,914
Investing activities:    
Acquisition of Blair facility 6,547 0
Purchases of property, plant and equipment (3,768) (2,213)
Proceeds from disposal of assets 0 (2)
Net cash used in investing activities (10,315) (2,215)
Financing activities:    
Repayments of notes payable (1,776) (1,672)
Payments under finance leases 35 31
Payment of contingent consideration 0 (180)
Employee stock purchase plan issuance 25 17
Purchase of treasury stock (127) (141)
Net cash used in financing activities (1,913) (2,007)
Net decrease in cash and cash equivalents (20,890) (308)
Cash and cash equivalents at beginning of year 25,588 11,725
Cash and cash equivalents at end of period 4,698 11,417
Noncash Investing and Financing Items [Abstract]    
Capitalized expenditures in accounts payable and accrued expenses 157 1,097
Issuance of acquisition common stock 0 20
Asset retirement obligation $ 8,281 $ 737