Condensed Consolidated Statement of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities:
Net (loss) income	$ (26,137,651)	$ 10,533,257
Adjustments to reconcile net (loss) income to net cash flows from operating activities:
Depreciation and amortization	685,759	745,396
Derivative (gain) loss	(1,417,537)	5,346,039
Purchase of Arcion license with common stock	2,072,136
Stock-based compensation expense	1,365,259	700,008
Changes in assets and liabilities:
Accounts receivable	11,796	78,040
Prepaid expenses and other assets	(21,672)	100,759
Accounts payable and accrued expenses	1,121,820	751,170
Income tax payable	85,000
Deferred revenue	(3,530,926)	14,697,863
Net cash flows from operating activities	(25,766,016)	32,952,532
Investing activities:
Purchase of equipment	(1,648)	(24,792)
Purchase of intangible assets		(1,050,000)
Net cash flows from investing activities	(1,648)	(1,074,792)
Financing activities:
Proceeds from exercise of stock options	9,235	410,402
Change in amounts due to related parties		(7,805)
Net cash flows from financing activities	9,235	402,597
Net change in cash and cash equivalents	(25,758,429)	32,280,337
Cash and cash equivalents at beginning of period	63,189,307	10,750,205
Cash and cash equivalents at end of period	$ 37,430,878	$ 43,030,542