Stockholders' Equity (Details Textual) (USD $)	1 Months Ended									12 Months Ended									129 Months Ended	12 Months Ended				1 Months Ended		12 Months Ended					12 Months Ended														1 Months Ended	3 Months Ended	12 Months Ended				21 Months Ended	9 Months Ended	12 Months Ended	21 Months Ended	12 Months Ended																			12 Months Ended
	Jan. 31, 2012	Feb. 28, 2011	Oct. 31, 2010	Sep. 30, 2010	Mar. 31, 2010	Jul. 31, 2009	Nov. 30, 2007	Mar. 31, 2007	Feb. 28, 2006	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2007	Dec. 31, 2006	Dec. 31, 2005	Dec. 31, 2004	Dec. 31, 2012	Dec. 31, 2012 Executive Officer [Member]	Dec. 31, 2011 Executive Officer [Member]	Dec. 31, 2010 Executive Officer [Member]	Dec. 31, 2005 Facilitation Of Merger [Member]	May 31, 2006 Finders Agreement [Member]	Mar. 31, 2010 Offering 2010 [Member]	Dec. 31, 2007 Placement 2007 [Member]	Dec. 31, 2006 Placement 2006 [Member]	Dec. 31, 2004 Placement 2004 [Member]	Dec. 31, 2006 Placement Agent [Member] Placement 2006 [Member]	Dec. 31, 2012 Placement Agent [Member] Placement 2006 [Member]	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Dec. 31, 2010 Common Stock [Member]	Dec. 31, 2008 Common Stock [Member]	Dec. 31, 2007 Common Stock [Member]	Dec. 31, 2006 Common Stock [Member]	Dec. 31, 2005 Common Stock [Member]	Dec. 31, 2010 Common Stock [Member] Cash Exercises One [Member]	Dec. 31, 2011 Common Stock [Member] Cashless Exercises [Member]	Dec. 31, 2010 Common Stock [Member] Cashless Exercises [Member]	Dec. 31, 2009 Common Stock [Member] Cashless Exercises [Member]	Dec. 31, 2008 Common Stock [Member] Cashless Exercises [Member]	Dec. 31, 2007 Common Stock [Member] Cashless Exercises [Member]	Dec. 31, 2006 Common Stock [Member] Cashless Exercises [Member]	Dec. 31, 2011 Common Stock [Member] Cash Exercise [Member]	Mar. 31, 2011 Common Stock [Member] Cash Exercise [Member]	Dec. 31, 2012 Common Stock [Member] Cash Exercise [Member]	Dec. 31, 2008 Common Stock [Member] Cash Exercise [Member]	Dec. 31, 2007 Common Stock [Member] Cash Exercise [Member]	Dec. 31, 2010 Common Stock [Member] Cashless Exercises One [Member]	Dec. 31, 2003 Common Stock [Member] Founders [Member]	Dec. 31, 2002 Unpaid Subscription On Common Stock [Member]	Dec. 31, 2004 Unpaid Subscription On Common Stock [Member]	Dec. 31, 2003 Unpaid Subscription On Common Stock [Member] Founders [Member]	Dec. 31, 2010 March [Member]	Dec. 31, 2007 March [Member]	Dec. 31, 2004 March [Member] License Fee [Member]	Dec. 31, 2010 March [Member] Common Stock [Member]	Dec. 31, 2007 March [Member] Common Stock [Member]	Dec. 31, 2004 March [Member] Common Stock [Member] License Fee [Member]	Dec. 31, 2008 April [Member]	Dec. 31, 2008 April [Member] License Fee [Member]	Dec. 31, 2007 April [Member] License Fee [Member]	Dec. 31, 2004 April [Member] Chief Executive [Member]	Dec. 31, 2008 April [Member] Common Stock [Member]	Dec. 31, 2007 April [Member] Common Stock [Member] License Fee [Member]	Dec. 31, 2004 April [Member] Common Stock [Member] Chief Executive [Member]	Dec. 31, 2007 May [Member]	Dec. 31, 2006 May [Member]	Dec. 31, 2006 May [Member] License Fee [Member]	Dec. 31, 2006 May [Member] Common Stock [Member] License Fee [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2012 Minimum [Member]	Dec. 31, 2012 Stock Option [Member]	Dec. 31, 2012 Stock Incentive Plan [Member]
Preferred Stock, Shares Authorized										5,000,000	5,000,000								5,000,000
Preferred Stock, Shares Issued										0	0								0
Stock Issued During Period, Shares, New Issues	4,989,275	10,062,500	8,214,286	634,500	6,700,000	3,325,000	7,388,172	2,648,306								7,166,666		5,532,994														1,993,444	8,214,286																		5,428,217							6,700,000	2,648,306	471,816					30,612	26,643	478,330				63,131
Equity Issuance Dollar Amount Per Share																																																							$ 2.50	$ 4.33	$ 0.0009					$ 4.90	$ 5.63	$ 0.0009	$ 4.90				$ 4.35
Stock Issued During Period, Value, New Issues											$ 8,372,464																					$ 199																			$ 542			$ (4,625)	$ 16,762,923	$ 11,476,677	$ 402	$ 670	$ 265	$ 47	$ 150,000		$ 150,000	$ 408	$ 3	$ 3	$ 48			$ 274,621	$ 6
Warrants Issued To Purchase Common Stock, Shares					2,345,000			794,492	716,666	1,286,764						2,149,999		483,701					105,516	250,000	2,345,000	794,492	2,149,999	483,701	716,666
Receipt Of Cash For Stock Subscription Receivable																		4,625																																		4,625	4,625
Warrants Outstanding										2,023,530	2,875,022								2,023,530
Warrant Fair Value					3,900,000			1,300,000	700,000							1,100,000		14,000					26,700	433,750	3,900,000	1,300,000	1,100,000	14,000	705,000
Warrants Exercised During Period																											2,131,399											65,555	331,245	26,379	119,691	100,487	116,596	30,422	37,277	1,993,444	57,000	11,200	61,200	1,058,236
Warrants Exercise Price																							$ 2.62	$ 4.31	$ 2.79	$ 5.66		$ 2.88	$ 3.30									$ 4.20	$ 2.89	$ 2.62	$ 3.27	$ 2.91	$ 2.90	$ 2.89	$ 2.89	$ 4.20	$ 3.30	$ 4.20	$ 4.20	$ 2.79
Warrants and Rights Outstanding																														486,766
Warrant Description					These warrants had an aggregate fair value of approximately $3.9 million, permit the holders to purchase the underlying common shares at $2.79 each or elect a net share settlement and are exercisable in whole at any time, or in part from time to time, during the period commencing six months after the date of issuance and ending three years from the date of issuance.																					The warrants are redeemable at par value at the Company's option in the event that the volume weighted-average closing price of the Company's common stock is greater than $12.00 per share for any 20 consecutive trading days provided the Company gives 60 business days' written notice to the holders and simultaneously call all warrants on the same terms.	The warrants permitted the holders to purchase the underlying common shares at $4.20 each and were exercisable in whole at any time, or in part from time to time, for cash, for five years from the date of issuance. In addition, these warrants were redeemable at the Company's option in the event that the volume weighted average closing bid price of its common stock for any 20 consecutive trading days was at least $9.00 per share.
Unexercised Warrants																											18,600
Percentage Of Purchase Price Per Share On Exercise Price																												110.00%	110.00%
Debt Instrument, Convertible, Conversion Price																												$ 2.89
Stock Issued To Warrant Holders																																							149,950	14,298	63,927	57,983	68,136	15,461			17,148			661,930
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value										48,900									48,900
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price										$ 3.97	$ 4.32	$ 3.66							$ 3.97
Class of Warrant or Right, Exercise Price of Warrants or Rights																																																																								4.31	2.79
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights										Each option granted to employees and non-employee directors during 2012, 2011 and 2010 vests as to 25% of the shares on each of the first, second, third and fourth anniversary of the vesting commencement date.
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period																				837,150	40,000	12,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period										35,210				94,230	17,868	78,683	14,663														35,210			94,230	17,868	78,683	14,663																																					35,210
Share-Based Compensation Arrangements By Share-Based Payment Award, Options, Exercises In Period, Weighted Average Exercise Price										$ 0.20				$ 0.63	$ 0.88	$ 0.06	$ 0.07																																																									$ 0.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value																																																																										44,900
Proceeds From Warrant Exercises										$ 0	$ 8,480,135	$ 275,331							$ 9,054,546																			$ 275,000							$ 100,000	$ 8,400,000		$ 47,040	$ 252,040
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Grants In Period, Gross										2,136,000	1,190,500	861,000	938,290	837,500	665,500	668,085	761,451	363,835																																																									10,400,000