Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net (loss)/income	$ (47,432)	$ 1,097
Adjustments to reconcile net (loss) / income to net cash (used for) provided by operating activities:
Depreciation and amortization	2,438	2,797
Change in Fair value of warrant	5,278	309
Share-based compensation expenses	28,541	0
Asset retirement obligation accretion	102	90
Amortization of intangible	38	37
Amortization of debt issuance costs and discounts	1,297	1,391
Noncash interest expense	0	16
Bad debt provision	20
Bad debt (recovery)	0	(38)
Changes in operating assets and liabilities:
Accounts receivable, net	(1,291)	3,751
Inventories, net	(469)	(1,480)
Prepaid expenses and other assets	(889)	78
Accounts payable and accrued expenses	2,754	4,219
Deferred revenue	(566)	966
Net cash (used for) provided by operating activities	(10,179)	13,233
Cash flows from investing activities:
Capital expenditures	(1,334)	(1,980)
Net cash (used for) investing activities	(1,334)	(1,980)
Cash flows from financing activities:
Proceeds from initial offering of common stock	68,714	0
Proceeds from warrant exercise	0	24
Proceeds from issuance of debt	0	5,000
Payments for deferred offering costs	(4,695)	(43)
Payments for taxes on share-based compensation	(5,903)	0
Net cash provided by financing activities	58,116	4,981
Net increase in cash and cash equivalents	46,603	16,234
Cash and cash equivalents:
Beginning of period	17,379	9,209
End of period	63,982	25,443
Supplemental disclosures of cash flow information:
Cash payments for interest	4,471	4,346
Net increase (decrease) in capital expenditures included in accounts payable and accrued expenses	(145)	13
Net (decrease) in deferred offering costs included in accounts payable and accrued expenses	(515)	0
Accrued withholding tax for share-based compensation	1,701	0
Accrued Series A-2 and A-3 preferred dividends	0	1,854
Reclass of deferred offering costs charged to additional paid in capital	5,230	0
Noncash component of warrants exercised	$ 12,951	$ 0