Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	1 Months Ended																				3 Months Ended											6 Months Ended		9 Months Ended	12 Months Ended					4 Months Ended						1 Months Ended
	Sep. 30, 2013	May 31, 2013	Sep. 30, 2012	Aug. 31, 2012	Jan. 31, 2012	Nov. 30, 2011	Oct. 31, 2011	May 31, 2011	Nov. 30, 2010	Oct. 31, 2009	Oct. 31, 2008	May 31, 2008	Mar. 31, 2008	Jan. 31, 2008	Aug. 31, 2007	Mar. 31, 2007	Dec. 31, 2006	Sep. 30, 2006	Jul. 31, 2006	Jan. 31, 2006	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Jun. 30, 2009	Mar. 31, 2009	Dec. 31, 2008	Sep. 30, 2008	Jun. 30, 2008	Mar. 31, 2008	Nov. 30, 2007	Dec. 31, 2009	Dec. 31, 2007	Sep. 30, 2011	Dec. 31, 2010	Dec. 31, 2007	Dec. 31, 2007 Class A Warrant [Member]	Dec. 31, 2008 Class B Warrant [Member]	Dec. 31, 2007 Class B Warrant [Member]	Dec. 31, 2007 Maximum [Member]	Dec. 31, 2007 Minimum [Member]	Oct. 31, 2013 Series A Preferred Stock [Member] Preferred Stock [Member]	Sep. 30, 2013 Series A Preferred Stock [Member] Preferred Stock [Member]	Aug. 31, 2013 Series A Preferred Stock [Member] Preferred Stock [Member]	Jun. 30, 2013 Series A Preferred Stock [Member] Preferred Stock [Member]	Nov. 30, 2013 Series B-1 Preferred Stock [Member] Preferred Stock [Member]	Dec. 31, 2013 Series B-1 Preferred Stock [Member] Preferred Stock [Member]
Stock option exercised, per share	$ 0.68		$ 0.68	$ 0.68													$ 0.10	$ 0.10			$ 2.76	$ 2.73	$ 2.90	$ 0.10	$ 2.76	$ 0.10	$ 4.25	$ 2.90	$ 2.73	$ 0.10		$ 4.25	$ 4.25	$ 0.10	$ 3.17	$ 0.10				$ 2.76	$ 2.51
Proceeds from sale of common stock, per share																																												$ 8.00	$ 8.00
Warrant discount, price per share																																												$ 0.90	$ 0.90
Conversion of convertible securities, price per share																																										$ 0.80	$ 0.80			$ 1.15	$ 1.15
Conversion of convertible securities, make-whole, price per share																																										$ 1.07	$ 0.83			$ 0.69	$ 0.88
Proceeds from issuance of preferred stock																																														$ 10
Transfer of assets at historical cost, per share																				$ 0.03
Units issued, per unit price																			$ 5.50
Stock issued to bridge loan lenders, per share																			$ 2.75
Conversion of public warrants, per share																																					$ 6.60	$ 11.00	$ 11.00
Redemption of public warrants, per share																																					$ 0.25
Common stock under private placement, per share										$ 6.50	$ 6.176		$ 9.262		$ 7.198	$ 5.77
Public warrants under private placement, per share													$ 3.954		$ 1.91
Exercise of representative's warrants, per unit														6.60																	6.60
Proceeds from secondary public offering, per share												$ 14.00
Proceeds from public offering, per share		$ 0.57		$ 1.20					$ 4.15	$ 6.50
Issuance of commons stock to service provider, per share		$ 0.68						$ 1.31
Proceeds from private offering, per share						$ 1.15
At-the-Market offering, per share			$ 1.83		$ 0.50	$ 0.83	$ 0.81