CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows From Operating Activities:
Net loss	$ (65,795)	$ (138,493)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	106	80
Amortization of deferred debt costs and debt discount	805	785
Accretion of back-end facility fee	330	0
Stock-based compensation expense	6,194	16,195
Interest expense — Payment-in-kind (PIK)	3,386	0
Change in fair value of derivative instruments—warrants	(8,248)	(161)
Debt conversion expense	0	1,209
Changes in operating assets and liabilities:
Accounts receivable	(2,020)	(1,782)
Inventories	(395)	(6,213)
Deferred revenues, net	5,000	1,498
Security deposit	0	(64)
Accounts payable and accrued expenses	(9,549)	13,714
Prepaid expenses and other current assets	(3,303)	(7,479)
Accrued interest expense on senior convertible notes	0	(61)
Total Adjustments	(7,694)	17,721
Net Cash used in Operating Activities	(73,489)	(120,772)
Cash Flows From Investing Activities:
Additions to property and equipment	(193)	(15)
Net Cash used in Investing Activities	(193)	(15)
Cash Flows From Financing Activities:
Proceeds of sale of common stock, net of issuance costs	0	121,604
Payment for deferred financing costs	(2,500)	(1,591)
Proceeds from exercise of stock options	429	347
Net Cash (used in) provided by Financing Activities	(2,071)	120,360
Net decrease in cash and cash equivalents	(75,753)	(427)
Cash and cash equivalents at beginning of period	136,986	82,387
Cash and cash equivalents at end of period	61,233	81,960
Supplementary disclosure of cash flow information:
Cash paid for interest on senior convertible notes	698	698
Cash paid for interest on long term debt	1,603	0
Cash paid for taxes	0	44
Supplementary disclosure of non-cash investing and financing activities:
Conversion of senior convertible notes to Synergy Common Stock	$ 0	$ 4,912