Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (7,459,721)	$ (6,256,142)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	74,837	67,734
Stock-based compensation expense	1,427,265	1,576,537
Change in fair value of warrant liability	(648,876)	(634,401)
Non-cash interest expense on investments	69,046	163,826
Amortization of debt issuance costs	52,427	52,389
Non-cash in-kind interest accrued on Curis Royalty's debt		582,062
Payment-in kind interest on Curis Royalty's debt	(711,353)
Changes in operating assets and liabilities:
Accounts receivable	(3,366,224)	44,877
Prepaid expenses and other assets	131,908	(34,941)
Accounts payable and accrued liabilities	395,205	133,810
Total adjustments	(2,575,765)	1,951,893
Net cash used in operating activities	(10,035,486)	(4,304,249)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of investments	(25,347,887)	(27,704,396)
Sales of investments	35,736,387	26,097,035
Purchases of property and equipment	(58,861)	(34,957)
Decrease in restricted cash	13,877	13,918
Net cash provided by/(used in) investing activities	10,343,516	(1,628,400)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock under the Company's share-based compensation plans and warrant exercises	256,843	3,189,353
Payment of debt issuance costs		(261,475)
Net cash provided by financing activities	256,843	2,927,878
NET INCREASE/(DECREASE) IN CASH AND CASH EQUIVALENTS	564,873	(3,004,771)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	9,591,487	12,747,709
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 10,156,360	$ 9,742,938