CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net (loss) income	$ (38,441)	$ 40,839
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation, depletion and accretion of asset retirement obligation	18,937	16,092
Amortization of intangible assets	596	596
Loss on disposal of assets	223	299
Bad debt expense	19,592	0
Amortization of deferred financing cost	79	79
Accretion of debt discount	140	138
Deferred income taxes	(7,543)	238
Stock-based compensation, net	2,131	2,909
Employee stock purchase plan compensation	24	29
Change in contingent consideration fair value	0	(1,020)
Gain on bargain purchase, net of cash acquired	0	(39,580)
Changes in assets and liabilities:
Accounts receivable	34,791	(7,029)
Unbilled receivables	(1,113)	(4,491)
Inventory	3,755	306
Prepaid expenses and other assets	(1,886)	3,751
Deferred revenue	6,092	3,912
Accounts payable	1,564	(205)
Accrued and other expenses	(1,397)	(607)
Income taxes payable	0	5,968
Net cash provided by operating activities	37,544	22,224
Investing activities:
Purchases of property, plant and equipment	(6,976)	(7,444)
Proceeds from disposal of assets	78	51
Net cash used in investing activities	(6,898)	(7,393)
Financing activities:
Proceeds from the issuance of notes payable	0	952
Repayments of notes payable	(5,168)	(3,527)
Payments under equipment financing obligations	(92)	(87)
Payment of deferred financing and debt issuance costs	0	(20)
Proceeds from revolving credit facility	0	6,000
Repayment of revolving credit facility	0	(8,500)
Payment of contingent consideration	(180)	(310)
Proceeds from equity issuance	42	62
Purchase of treasury stock	(294)	(1,046)
Net cash used in financing activities	(5,692)	(6,476)
Net increase in cash and cash equivalents	24,954	8,355
Cash and cash equivalents at beginning of year	11,725	2,639
Cash and cash equivalents at end of period	36,679	10,994
Noncash Investing and Financing Items [Abstract]
Capitalized expenditures in accounts payable and accrued expenses	$ 267	$ 157