CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows From Operating Activities:
Net loss	$ (64,604)	$ (59,941)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	41	38
Amortization of deferred debt costs	608	4,153
Stock-based compensation expense	2,897	1,202
Change in fair value of derivative instruments—warrants	(122)	(260)
Common stock issued for interest on Notes	0	2,445
Debt conversion expense	1,209	25,615
Transaction fees on Note conversions	0	(435)
Changes in operating assets and liabilities:
Accounts receivable	(6,319)	0
Inventories	(4,007)	0
Security deposit	(65)	0
Prepaid expenses and other current assets	(7,149)	(56)
Accounts payable and accrued expenses	9,512	(800)
Deferred revenues, net	4,260	0
Accrued interest expense on senior convertible notes	287	487
Total Adjustments	1,152	32,389
Net Cash used in Operating Activities	(63,452)	(27,552)
Cash Flows From Investing Activities:
Net sales of available-for-sale securities	0	50,097
Additions to property and equipment	(15)	(43)
Net Cash used in (provided by) Investing Activities	(15)	50,054
Cash Flows From Financing Activities:
Proceeds of sale of common stock	121,951	0
Payment for deferred financing costs	(1,591)	0
Fees and expenses — sale of common stock	(347)	0
Proceeds from exercise of stock options	329	0
Net Cash provided by Financing Activities	120,342	0
Net increase in cash and cash equivalents	56,875	22,502
Cash and cash equivalents at beginning of period	82,387	61,653
Cash and cash equivalents at end of period	139,262	84,155
Supplementary disclosure of cash flow information:
Cash paid for taxes	44	45
Supplementary disclosure of non-cash investing and financing activities:
Conversion of senior convertible notes to Synergy Common Stock	$ 4,912	$ 82,274