Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows From Operating Activities:
Net loss	$ (25,981)	$ (8,394)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	1,413	1,217
Stock issued for milestone payments	1,350	0
Change in fair value of warrant liabilities	8,047	0
Depreciation	19	7
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(5,407)	202
Deposits and other assets	(12)	(2)
Accounts payable	7,690	937
Accrued liabilities	317	(732)
Accrued employee benefits	(144)	0
Net Cash Used In Operating Activities	(12,708)	(6,765)
Cash Flows From Investing Activities:
Purchases of property and equipment	(61)	(21)
Net Cash Used In Investing Activities	(61)	(21)
Cash Flows From Financing Activities:
Proceeds from issuance of common stock for stock option exercises	1	4
Net Cash Provided By Financing Activities	1	4
Net decrease in cash	(12,768)	(6,782)
Cash at beginning of period	17,525	14,625
Cash at end of period	4,757	7,843
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Cash paid for taxes	$ 0	$ 0