Stockholders' Equity (Details Textual) (USD $)	1 Months Ended				9 Months Ended		111 Months Ended
	Oct. 31, 2012	Aug. 31, 2012	Mar. 31, 2010	Oct. 31, 2009	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012
Stockholders Equity (Additional Textual) [Abstract]
Equity Offering sold and issued		4,462,686
Common stock offering price per share		$ 13.40
Issuance of common stock		$ 59,800,000
Issuance of common stock, net		55,800,000			56,130,000	2,000	196,950,000
Number of shares of common stock available for grant under 2007 Plan					2,221,071		2,221,071
Number of net issuance of shares			12,295	5,817
Expected dividend yield based on history and expectation of dividend payouts					0.00%
Unrecognized compensation costs approximately related to non-vested stock option awards granted					$ 7,300,000		$ 7,300,000
Weighted average remaining period recognized on straight-line basis, years					2 years 2 months 12 days
Warrants remaining of exercised shares	26,903
Stock issuance against the warrant	14,312
Restricted Stock Units (RSUs) [Member]
Stockholders' Equity (Textual) [Abstract]
Vesting period					4 years
Annual vesting rate					25.00%
Warrant [Member]
Stockholders' Equity (Textual) [Abstract]
Number of shares of common stock to be purchased for issuance of warrants			24,668	22,418	73,989
Exercise price of warrants, per share					$ 7.43
Warrants expiration date					2013-09
Number of shares of common stock outstanding for issuance of warrants					26,903		26,903