Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (13,039,864)	$ (8,123,980)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	114,058	104,359
Stock-based compensation expense	2,245,565	2,499,091
Change in fair value of warrant liability	(716,786)	438,286
Non-cash interest expense on investments	108,511	161,586
Amortization of debt issuance costs	68,716	78,605
Non-cash in-kind interest accrued on Curis Royalty's debt	0	753,639
Payment-in kind interest on Curis Royalty's debt	(713,968)	0
Gain on sale of fixed assets and equipment	(1,750)	0
Changes in operating assets and liabilities:
Accounts receivable	(362,131)	(248,405)
Prepaid expenses and other assets	(168,343)	(126,482)
Accounts payable and accrued liabilities	345,474	436,449
Total adjustments	919,346	4,097,128
Net cash used in operating activities	(12,120,518)	(4,026,852)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of investments	(38,284,246)	(43,908,127)
Sale of investments	49,353,851	36,339,252
Decrease in restricted cash	13,877	13,918
Purchases of property and equipment	(65,764)	(134,457)
Proceeds from sale of equipment	1,750	0
Net cash provided by/(used in) investing activities	11,019,468	(7,689,414)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock under the Company's share-based compensation plans and warrant exercises	256,843	3,514,595
Payment of Curis Royalty's principal obligations	(813,810)	0
Payment of debt issuance costs	0	(261,475)
Proceeds from issuance of common stock under the Company's ATM Agreements, net of issuance costs of $367,706 (see Note 8)	0	9,494,123
Net cash (used in)/provided by financing activities	(556,967)	12,747,243
NET (DECREASE)/ INCREASE IN CASH AND CASH EQUIVALENTS	(1,658,017)	1,030,977
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	9,591,487	12,747,709
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 7,933,470	$ 13,778,686