Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (36,948,000)	$ (17,413,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	21,966,000	27,340,000
Amortization of debt issuance costs, net	95,000	287,000
Stock-based compensation	936,000	1,740,000
Impairment of long-lived assets	15,579,000	237,000
Gain on disposal of property, plant and equipment	(384,000)	(1,828,000)
Bad debt recoveries	(129,000)	(65,000)
Change in fair value of derivative warrant liability	0	(32,000)
Deferred income taxes	40,000	204,000
Other, net	567,000	322,000
Changes in operating assets and liabilities:
Accounts receivable	10,667,000	412,000
Prepaid expenses and other receivables	(141,000)	(689,000)
Accounts payable and accrued liabilities	(892,000)	(7,240,000)
Other assets and liabilities, net	568,000	1,320,000
Net cash provided by operating activities	11,924,000	4,595,000
Cash flows from investing activities:
Proceeds from the sale of property, plant and equipment	1,596,000	4,826,000
Purchases of property, plant and equipment	(2,802,000)	(7,341,000)
Net cash used in investing activities	(1,206,000)	(2,515,000)
Cash flows from financing activities:
Payments on First and Second Lien Term Loans	(5,496,000)	(3,600,000)
Proceeds from Revolving Facility	101,182,000	139,661,000
Payments on Revolving Facility	(101,182,000)	(139,661,000)
Proceeds from PPP Loan	4,000,000	0
Payments on Bridge Term Loan	0	(31,382,000)
Proceeds from the issuance of stock	0	31,057,000
Payments on finance leases and other financing activities	(1,463,000)	(1,701,000)
Net cash used in financing activities	(2,959,000)	(5,626,000)
Change in cash, cash equivalents and restricted cash	7,759,000	(3,546,000)
Cash and cash equivalents, beginning of period	4,788,000	7,302,000
Restricted cash, beginning of period	922,000	656,000
Cash, cash equivalents and restricted cash, beginning of period	5,710,000	7,958,000
Cash and cash equivalents, end of period	13,469,000	3,028,000
Restricted cash, end of period	0	1,384,000
Cash, cash equivalents and restricted cash, end of period	13,469,000	4,412,000
Supplemental disclosure of cash flow information:
Cash paid for interest	2,603,000	3,263,000
Cash paid for taxes, net	249,000	201,000
Property, plant and equipment purchases in accounts payable	403,000	0
Common stock issued to settle Bridge Term Loan	$ 0	$ 1,118,000