Consolidated Statements of Cash Flows (Unaudited) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows From Operating Activities:
Net loss	$ (19,067,397)	$ (12,332,008)	$ (10,029,591)
Depreciation and amortization	391,595	145,155	47,916
Share-based compensation, net	1,244,342	1,409,562	836,866
Fair value of common stock and warrants issued for services	96,375	153,464	448,940
(Gain) loss on revaluation of derivative warrant liability	(4,465,986)	(3,683,676)	1,762,938
Non-cash loss on extinguishment of debt			1,514
Non-cash interest expense			12,159
Non-cash loss on disposal of assets		21,272	5,688
Non-cash debt financing costs		455,000
Cash received from lessor as a lease incentive		236,974
Amortization of discount on note payable	2,879,166	120,834
Amortization of non-cash deferred financing costs	968,004	423,126
Accounts receivable		37,065	104,423
Prepaid expenses and other current assets	26,405	98,124	(79,003)
Deposits and other assets	(1,500)	9,999	(576)
Accounts payable	(1,282,899)	1,953,921	(240,336)
Deferred revenue from licensing arrangements	(27,600)	(5,119)	(302,059)
Accrued expenses and other liabilities	(170,341)	668,642	505,184
Net cash used in operating activities	(19,409,836)	(10,287,665)	(6,925,937)
Cash Flows from Investing Activities:
Purchase of furniture, equipment and leasehold improvements	(249,007)	(1,487,091)	(323,301)
Decrease (increase) in restricted cash	104,975	(157,463)	5,510
Net cash used in investing activities	(144,032)	(1,644,554)	(317,791)
Cash Flows From Financing Activities:
Proceeds from Montaur note payable		3,000,000
Repayment of Montaur note payable	(3,000,000)
Proceeds from issuances of Common Stock, preferred stock and warrants, net of costs	26,864,570	3,278,869	8,918,190
Principal payments for capital lease obligations	(2,527)	(2,288)	(2,071)
Proceeds from bridge notes			1,000,000
Repayment of bridge notes			(75,000)
Proceeds from the exercise of warrants		212,018	4,919,346
Proceeds from exercise of stock options		195,259	136,790
Net cash provided by financing activities	23,862,043	6,683,858	14,897,255
Net increase (decrease) in cash and cash equivalents	4,308,175	(5,248,361)	7,653,527
Cash and cash equivalents, beginning of period	3,747,210	8,995,571	1,342,044
Cash and cash equivalents, end of period	8,055,385	3,747,210	8,995,571
Supplemental Disclosure of Cash Flow Information and Non Cash Financing Transactions:
Cash paid for interest	275	515	1,768
Accretion of dividend on Series B Perpetual Redeemable Preferred Stock			157,733
Deemed dividend on beneficial conversion feature of convertible preferred stock	371,140		1,975,211
Issuance of common stock in settlement of short term note			35,500
Conversion of notes payable and accrued interest into Series D Convertible Preferred Stock			1,006,000
Conversion of convertible preferred stock into Common Stock at par value	20,150		50,000
Redemption of Series B Perpetual Redeemable Preferred Stock for Series C Preferred Stock in connection with October 27, 2011 warrant exercises			1,701,672
Reclassification of derivative warrant liability to additional paid-in capital		61,520	2,272,597
Fair value of warrants included in stock issuance costs			41,363
Common Stock subscription receivable			6,667
Fair value of Common Stock issued in connection with settlement agreement		(82,000)	290,000
Cancellation of restricted Common Stock			5,250
Deemed dividend on repricing of warrants			4,559,761
Fair value of Commitment Warrant issued in connection with debt financing		4,840,000
Fair value of Draw Warrant issued for note payable recorded as discount		3,000,000
Fair value Draw Warrant issued for note payable recorded as debt financing costs		$ 455,000