Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net (loss)/income	$ (14,726)	$ 4,099
Adjustments to reconcile net (loss)/income to net cash (used for)/provided by operating activities:
Depreciation and amortization	736	940
Change in fair value of warrant	0	(697)
Share-based compensation	1,520	0
Asset retirement obligation accretion	34	34
Amortization of intangible	13	13
Amortization of debt issuance costs and discounts	389	458
Non-cash interest expense	527
Non-cash interest income		(16)
Bad debt provision	6	39
Other, net	(51)	0
Changes in operating assets and liabilities:
Trade receivables and other receivables, net	(963)	(3,301)
Inventories, net	304	165
Prepaid expenses and other current assets	(1,715)	(51)
Accounts payable and accrued expenses	(3,306)	(721)
Deferred revenue	(448)	(177)
Net cash (used for)/provided by operating activities	(17,680)	785
Cash flows from investing activities:
Capital expenditures	(376)	(259)
Net cash (used for) investing activities	(376)	(259)
Cash flows from financing activities:
Payments for deferred financing costs	0	(1,417)
Payments for taxes on share-based compensation	(2,609)	0
Net cash (used for) financing activities	(2,609)	(1,417)
Net decrease in cash and cash equivalents	(20,665)	(891)
Cash and cash equivalents:
Beginning of period	60,599	17,379
End of period	39,934	16,488
Supplemental disclosures of cash flow information:
Cash payments for interest	1,009	1,485
Net (decrease)/increase in accrued capital expenditures	(253)	15
Net increase in financing costs included in accounts payable and accrued expenses	311	0
Accrued withholding tax for share based compensation	$ (4)	$ 0