Condensed Consolidated Statements of Cash Flows - USD ($)	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net loss	$ (29,823,000)	$ (11,361,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	15,145,000	18,412,000
Amortization of debt issuance costs, net	81,000	247,000
Stock-based compensation	612,000	1,415,000
Impairment of long-lived assets	15,579,000	117,000
Gain on disposal of property, plant and equipment	(342,000)	(1,706,000)
Bad debt recoveries	(160,000)	(9,000)
Change in fair value of derivative warrant liability	0	(28,000)
Deferred income taxes	40,000	112,000
Other, net	375,000	55,000
Changes in operating assets and liabilities:
Accounts receivable	9,772,000	2,724,000
Prepaid expenses and other receivables	382,000	(576,000)
Accounts payable and accrued liabilities	(2,271,000)	(6,059,000)
Other assets and liabilities, net	435,000	1,111,000
Net cash provided by operating activities	9,825,000	4,454,000
Cash flows from investing activities:
Proceeds from the sale of property, plant and equipment	1,548,000	4,525,000
Purchases of property, plant and equipment	(2,328,000)	(5,019,000)
Net cash used in investing activities	(780,000)	(494,000)
Cash flows from financing activities:
Payments on First and Second Lien Term Loans	(1,909,000)	(2,514,000)
Proceeds from Revolving Facility	76,202,000	96,677,000
Payments on Revolving Facility	(76,202,000)	(96,677,000)
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	(1,053,000)	(1,226,000)
Net cash provided by (used in) financing activities	1,038,000	(4,065,000)
Change in cash, cash equivalents and restricted cash	10,083,000	(105,000)
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	15,793,000	5,978,000
Restricted cash, end of period	0	1,875,000
Cash, cash equivalents and restricted cash, end of period	15,793,000	7,853,000
Supplemental disclosure of cash flow information:
Cash paid for interest	1,764,000	2,218,000
Cash paid for taxes, net	181,000	138,000
Property, plant and equipment purchases in accounts payable	481,000	0
Common stock issued to settle Bridge Term Loan	$ 0	$ 1,118,000