CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows From Operating Activities:
Net loss	$ (98,497)	$ (61,057)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	79	67
Amortization of deferred transaction costs	4,406	2,516
Stock-based compensation expense	3,909	7,794
Accretion of discount/premium on available for sale securities	0	(87)
Change in fair value of derivative instruments—warrants	(237)	1,810
Common stock issued for interest on Notes	2,445	0
Debt conversion expense	25,615	0
Transaction fees on Note conversions	(434)	0
Changes in operating assets and liabilities:
Security deposit	0	(56)
Accounts payable and accrued expenses	4,546	(1,294)
Prepaid expenses and other current assets	(961)	1,549
Accrued interest expense on Senior Convertible Debentures	(998)	(277)
Total Adjustments	38,370	12,022
Net Cash used in Operating Activities	(60,127)	(49,035)
Cash Flows From Investing Activities:
Net sales (purchases) of available-for-sale securities	50,097	(50,000)
Additions to property and equipment	(272)	(8)
Net Cash provided by (used in) Investing Activities	49,825	(50,008)
Cash Flows From Financing Activities:
Proceeds of sale of common stock	89,845	14,672
Fees and expenses — sale of common stock	0	(404)
Proceeds from exercise of stock options	23	0
Net Cash provided by Financing Activities	89,868	14,268
Net increase (decrease) in cash and cash equivalents	79,566	(84,775)
Cash and cash equivalents at beginning of period	61,653	146,470
Cash and cash equivalents at end of period	141,219	61,695
Supplementary disclosure of cash flow information:
Cash paid for taxes	45	224
Supplementary disclosure of non-cash investing and financing activities:
Conversion of Senior Convertible Debentures to Synergy Common Stock	$ 82,274	$ 22,213