Acquisition and Stockholders' Equity (Deficit) (Details 2) (USD $)	0 Months Ended	3 Months Ended					12 Months Ended					86 Months Ended			12 Months Ended		0 Months Ended			1 Months Ended	0 Months Ended	3 Months Ended		0 Months Ended					1 Months Ended	0 Months Ended										1 Months Ended	0 Months Ended								3 Months Ended		0 Months Ended					0 Months Ended
	Jan. 29, 2012	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2012	Nov. 20, 2009	Jan. 15, 2013 Subsequent Event	Dec. 31, 2011 Selling agent	Dec. 31, 2009 Securities purchase agreement 2009	Jul. 08, 2010 June 30, 2010, securities purchase agreements	Jun. 30, 2010 June 30, 2010, securities purchase agreements	Jul. 09, 2010 June 30, 2010, securities purchase agreements	Jul. 31, 2010 June 30, 2010, securities purchase agreements	Aug. 16, 2010 August 16, 2010 securities purchase agreements	Oct. 12, 2010 July 13, 2010 and October 12, 2010 extended lock-up agreement	Jun. 22, 2010 July 13, 2010 and October 12, 2010 extended lock-up agreement	Oct. 01, 2010 October 1, 2010 securities purchase agreements	Oct. 18, 2010 October 18, 2010 securities purchase agreements	Mar. 04, 2011 March 4, 2011 registered direct offering	Dec. 19, 2011 May 2 to May 23, 2011 securities purchase agreements	Oct. 04, 2011 May 2 to May 23, 2011 securities purchase agreements	May 23, 2011 May 2 to May 23, 2011 securities purchase agreements	Jun. 03, 2011 Warrants exercised on June 3, 2011	Dec. 19, 2011 June 3 to June 15, 2011 securities purchase agreements	Jun. 15, 2011 June 3 to June 15, 2011 securities purchase agreements	Jun. 15, 2011 June 3 to June 15, 2011 securities purchase agreements	Jul. 11, 2011 July 11, 2011 securities purchase agreements	Dec. 07, 2011 July 28, 2011 securities purchase agreements	Jul. 28, 2011 July 28, 2011 securities purchase agreements	Oct. 04, 2011 October 4, 2011 securities purchase agreements	Oct. 19, 2011 October 19, 2011 securities purchase agreements	Oct. 28, 2011 October 28, 2011 securities purchase agreements	Oct. 31, 2011 October 2011 warrants	Nov. 14, 2011 November 14, 2011 securities purchase agreements	Dec. 15, 2011 December 2011 Public Offering	Dec. 06, 2011 December 2011 Public Offering	Dec. 07, 2011 December 2011 Public Offering	Dec. 02, 2011 December 2011 Public Offering	Jun. 06, 2012 May 2012 Public Offering	May 09, 2012 May 2012 Public Offering	Jun. 21, 2012 June 21, 2012 Equity sales agreement	Dec. 31, 2012 June 21, 2012 Equity sales agreement	Mar. 18, 2013 June 21, 2012 Equity sales agreement Subsequent Event	Oct. 16, 2012 Callisto Merger Agreement	Jul. 23, 2012 Callisto Merger Agreement	Dec. 31, 2012 Callisto Merger Agreement	Oct. 15, 2012 Callisto Merger Agreement	Oct. 14, 2012 Callisto Merger Agreement	Jan. 17, 2013 Callisto Merger Agreement Subsequent Event
Common stock issued (in shares)																11,407,213								500,000	305,000	300,000			416,667			193,541		40,458		333,782													815,654	758,093
Price per share (in dollars per share)																$ 1.40																				$ 7.00													$ 5.04	$ 6.16
Fees and expenses associated with offering							$ 3,774,000	$ 2,148,000	$ 468,000	$ 260,000	$ 73,000					$ 260,002		$ 25,000																															$ 123,385
Gross proceeds from offering																	2,499,000	255,000	2,754,000		400,000			2,500,000	1,525,000	1,800,000			2,499,999				1,161,243	242,750			2,348,723	581,876	500,000		5,648,000		15,000,000
Number of units issued for services (in units)															77,750
Number of units sold																		324,000			49,383																552,647	136,912	117,647		1,328,941				1,875,000
Unit price (in dollars per share)																		$ 8.50			$ 8.10			$ 5.00	$ 5.00	$ 6.00			$ 6.00				$ 6.00	$ 6.00			$ 4.25	$ 4.25	$ 4.25		$ 4.25		$ 8.00
Number of shares of common stock per unit															1			1			1			1	1												1	1	1		1				2
Number of warrants per unit															1			1			1			0.4	0.4												1	1	1		1				1
Number of common shares that can be acquired upon exercise of each warrant															1			1			1																0.5	0.5	0.5		1				1
Term of warrants															7 years			5 years			5 years			5 years	5 years	7 years			7 years				7 years	7 years			5 years	5 years	5 years		5 years				5 years
Exercise price of warrants (in dollars per share)															$ 6.50			$ 9.00			$ 8.50			$ 5.50	$ 5.50	$ 6.20		$ 4.25	$ 6.50			$ 6.50	$ 6.50	$ 6.50			$ 5.50	$ 5.50	$ 5.50		$ 5.50				$ 5.50
Fees paid related to equity offerings							3,774,000	2,148,000	468,000			6,724,000								261,630				50,000	91,000																					405,000	2,952,930			140,126
Common stock issued as consideration to extend lock-up agreements																						670,933
Percentage of shares of previously issued common stock, which are currently subject to a lock-up agreement																							5.00%
Fair value of common stock issued to accomplish lock-up extension									3,235,000			3,235,000										3,235,040
Aggregate number of shares that can be purchased by warrants issued (in shares)															9,025									200,000	122,000	210,000			416,667			193,541	193,541	40,458
Period from issuance for which exercise price is protected, in the event of subsequent equity sales at a lower price																													2 years
Derivative liabilities reclassified to equity		169,000			1,707,000																						725,000			486,328	315,901			73,931						593,296
Exercise of warrant to purchase common stock (in shares)						80,000																								80,000
Proceeds from exercise of warrants								415,000				415,000																		415,309
Purchase price of 49,383 shares (in dollars per share)																														$ 5.00
Number of shares with purchase price of $5.00 per share																														49,383
Purchase price of 30,617 shares (in dollars per share)																														$ 5.50
Number of shares with purchase price of $5.50 per share																														30,617
Maximum period for registration of shares of common stock and shares of common stock underlying the warrants in a resale registration statement																																	45 days	45 days
Common stock issued to make whole certain shares (in shares)																																			215,981
Purchase price per share paid including common stock issued to make whole certain shares (in dollars per share)																																			$ 4.25
Decrease in the prospective exercise proceeds attributable to warrants																												937,500
Additional shares of common stock purchased by underwriters to cover over-allotment																																													281,250		1,500,000
Gross proceeds from exercise of over-allotment option by underwriters																																										2,250,000				6,750,000
Options granted to underwriters and principals (in shares)																																												112,500
Term of options granted to underwriters and principals																																												3 years
Exercise price of options granted to underwriters and principals																																												$ 5.00
Warrant term															5 years
Exercise price (in dollars per share)															$ 5.50
Warrants classified to equity instruments (in shares)		112,500			1,055,268										8,025
Warrants classified to derivative liability (in shares)			112,500												78,750
Common stock issued for professional services rendered (in shares)	26,272							79,000
Value of common stock issued for professional services rendered, recorded as legal expense				92,663			93,000	341,000	18,000	2,000
Fair value of common stock issued professional services rendered (in dollars per share)	$ 3.53
Number of shares of common stock closed under an underwritten public offering																																															10,000,000
Common stock price per share for public offering and over-allotment (in dollars per share)																																															$ 4.50
Gross proceeds from the offering							55,862,000	34,369,000	7,179,000			116,406,000				15,970,100																				2,336,472										51,750,000	45,000,000		4,111,802	4,670,861
Period during which underwriters could purchase additional shares to cover over-allotments																																															45 days
Amount paid to investment bank in relation to fairness option																																																			74,945	207,905
Exchange Ratio of shares																																																						0.1799	0.17	0.1799
Lock-up period																																																								24 months
Cancellation of stock (in shares)																																																								22,295,000
Amount due from related party - eliminated during merger																																																					3,305,636
Maximum number of shares issuable under agreement																																																30,000,000
Attorney's fee																																																	10,000
Authorized number of common shares		100,000,000			100,000,000		100,000,000	100,000,000				100,000,000	100,000,000	200,000,000
Shares issued in connection with merger																																																								28,605,354
Net liabilities																																																								$ 1,700,000