CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net loss	$ (65,627)	$ (53,821)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	23,564	26,652
Amortization of debt issuance costs and original issue discount	1,248	513
Provision for doubtful accounts	396	145
Deferred income taxes	106	(167)
Loss (gain) on disposal or impairment of assets	12,948	(1,097)
Loss on sale of Russian proppant business		350
Noncash lease expense	24
Stock compensation expense	2,334	3,027
PIK repayment on notes payable, related parties	(2,040)
Change in fair value of derivative instruments		(1,974)
Changes in operating assets and liabilities:
Trade accounts and other receivables	13,385	(109)
Inventories	5,904	5,132
Prepaid expenses and other current assets	1,728	104
Accounts payable	(977)	(4,044)
Accrued expenses	522	(2,413)
Income tax receivable, net	(819)	92
Other, net	(85)	2,757
Net cash used in operating activities	(7,389)	(24,853)
Investing activities
Capital expenditures	(2,197)	(1,668)
Net proceeds from asset sales	839	5,233
Net cash (used in) provided by investing activities	(2,950)	3,565
Financing activities
Repayments on notes payable	(1,863)	(941)
Repayments on long-term debt	(14,533)
Repayments on notes payable, related parties	(25,000)
Proceeds from long-term debt	14,533
Payment of debt issuance costs	(218)
Purchase of common stock	(279)	(421)
Net cash (used in) provided by financing activities	(22,754)	1,487
Net decrease in cash and cash equivalents and restricted cash	(33,093)	(19,801)
Cash and cash equivalents and restricted cash at beginning of period	83,317	78,385
Cash and cash equivalents and restricted cash at end of period	50,224	58,584
Supplemental cash flow information
Interest paid	6,796	6,751
ATM Program
Financing activities
Proceeds from issuance of common stock under ATM program	4,606	$ 2,849
Pic Onyx Inc
Investing activities
Investment in PicOnyx	(1,092)
Issuance of Note from PicOnyx	$ (500)

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