Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net loss	$ (19,284,530)	$ (24,621,440)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation	284,278	376,814
Unrealized loss on short-term investments		138,910
Noncash compensation	1,591,986	2,272,020
Change in value of warrant liability	(510,919)	160,749
Changes in operating assets and liabilities:
Accounts receivable	(565,336)	1,695,870
Other current assets	452,798	(435,305)
Other long-term assets	(3,995)	(2,554)
Accounts payable	(310,150)	(471,635)
Deferred revenue	(1,102,472)	3,821,991
Accrued interest	18,448
Accrued expenses	506,750	1,609,369
Net cash used in operating activities	(18,923,142)	(15,455,211)
Cash flows from investing activities:
Purchase of short-term investments		(4,898,314)
Sale of short-term investments	2,213,999	3,560,812
Purchase of equipment	(125,218)	(154,742)
Increase in restricted cash	(1,421,861)
Net cash provided by (used in) investing activities	666,920	(1,492,244)
Cash flows from financing activities:
Noncontrolling interest capital contribution to Incuron, LLC		5,893,557
Net proceeds from issuance of debt	7,297,675
Exercise of options	12,392	1,425
Repayment of capital lease obligation	(59,012)	(36,029)
Net cash provided by financing activities	7,251,055	5,858,953
Effect of exchange rate change on cash and equivalents	(333,995)	404,486
Decrease in cash and cash equivalents	(11,339,162)	(10,684,016)
Cash and cash equivalents at beginning of period	25,652,083	22,872,589
Cash and cash equivalents at end of period	14,312,921	12,188,573
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	17,105	17,253
Supplemental schedule of noncash financing activities:
Fair value of warrants issued in connection with debt	117,999
Equipment acquired through lease financing		$ 221,690