CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities
Net loss	$ (22,921)	$ (25,088)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	21	33
Noncash stock-based compensation	2,925	2,836
(Increase) decrease in prepaid expenses and other current assets	(124)	(75)
Increase (decrease) in accounts payable and accrued expenses	(433)	(576)
Net cash used in operating activities	(20,532)	(22,870)
Cash Flows from Investing Activities
Capital expenditures	0	0
Net cash used in investing activities	0	0
Cash Flows from Financing Activities
Exercise of stock options & warrants	0	147
Proceeds from a shareholder transaction	102	0
Net cash provided by financing activities	102	147
Net decrease in cash and cash equivalents	(20,430)	(22,723)
Cash and cash equivalents at beginning of period	46,620	75,807
Cash and cash equivalents at end of period	$ 26,190	$ 53,084