Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows From Operating Activities:
Net Loss	$ (33,488)	$ (13,304)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	2,059	1,827
Stock issued for milestone payments	1,350	0
Stock issued for exclusive channel collaboration agreement	3,000
Change in fair value of warrant liabilities	3,906	0
Depreciation	39	13
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(8,783)	209
Deposits and other assets	(8)	(2)
Accounts payable	5,030	731
Accrued liabilities	(1,054)	(774)
Accrued employee benefits	(224)	0
Deferred rent	253	0
Net Cash Used In Operating Activities	(27,920)	(11,300)
Cash Flows From Investing Activities:
Purchases of property and equipment	(457)	(43)
Net Cash Used In Investing Activities	(457)	(43)
Cash Flows From Financing Activities:
Proceeds from issuance of common stock	46,000	0
Cash paid as direct offering costs	(3,357)	0
Proceeds from issuance of common stock for stock option exercises	15	4
Net Cash Provided By Financing Activities	42,658	4
Net increase (decrease) in cash	14,281	(11,339)
Cash at beginning of period	17,525	14,625
Cash at end of period	31,806	3,286
Supplemental disclosures of cash flow information:
Cash paid for interest	0	0
Cash paid for taxes	$ 0	$ 0