Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (15,169)	$ (47,552)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation	3,235	3,123
Amortization of intangible assets	2,216	2,225
Write-off of intangible assets	507	0
Amortization of step-up in inventory basis	0	2,520
Amortization of lease right of use asset, net	49	0
Noncash adjustment of cylinder deposits	(502)	0
Lower of cost or net realizable value adjustment	488	26,694
Allowance for doubtful accounts	(407)	14
Value of share-based arrangements	900	632
Amortization of deferred finance costs	932	757
Deferred tax (benefit) expense	691	(1,101)
Changes in assets and liabilities:
Trade accounts receivable	(5,293)	(8,348)
Inventories	42,131	38,424
Prepaid and other assets	133	3,124
Income taxes receivable	0	9,664
Accounts payable and accrued expenses	(619)	5,138
Cash provided by operating activities	29,292	35,314
Cash flows from investing activities:
Additions to property, plant, and equipment	(930)	(992)
Cash used in investing activities	(930)	(992)
Cash flows from financing activities:
Proceeds from issuance of common stock	9	17
Repayment of short-term debt - net	(13,817)	(36,086)
Deferred financing costs	0	(1,045)
Repayment of long-term debt	(2,140)	(832)
Cash used in financing activities	(15,948)	(37,946)
Increase (decrease) in cash and cash equivalents	12,414	(3,624)
Cash and cash equivalents at beginning of period	2,272	5,002
Cash and cash equivalents at end of period	14,686	1,378
Supplemental Disclosure of Cash Flow Information:
Cash paid during period for interest	11,607	8,718
Cash refund from income taxes - net	$ (124)	$ (10,338)