Summary of Business and Significant Accounting Policies (Details Textual) (USD $)	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2012	Jul. 31, 2012	Sep. 30, 2012 Customer	Sep. 30, 2011	Sep. 30, 2012 Customer	Sep. 30, 2011	Dec. 31, 2011 Customer	Jul. 05, 2012	Feb. 21, 2012
Summary of Business and Significant Accounting Policies (Textual) [Abstract]
Stock issued, Shares		13,397,500
Number of common stock offered in IPO			600,000,000		600,000,000				1,750,980
Common stock offering price									$ 10.20
Compensation expense recognized, vesting term					48 months
Research and development			$ 10,783,000	$ 2,757,000	$ 26,098,000	$ 7,003,000
Deferred revenue recognized, period					12 months
Summary of Business and Significant Accounting Policies (Additional Textual) [Abstract]
Common stock Offering price, per share								$ 18.00
Net proceeds of stock after deducting underwriting discount and commission		173,300,000			169,799,000
Common stock estimated expenses		3,500,000
Compensation expense recognized, net of forfeiture activity, estimated annual percentage					4.00%
Number of customers represented more than ten percent of the accounts receivable balance			0		0		0
Property and Equipment useful lives					3 years
Percentage of accounts receivable, customer accounted					10.00%		10.00%
Percentage of revenues, customers exceeded individually			10.00%	10.00%	10.00%	10.00%
Capitalized Software Costs			2,300,000	0	2,300,000	0
Deferred rent recognition period					12 months
Lease Abandonment Costs					2,922,000
Cease-use loss	200,000
Loss on disposal of assets					(2,700,000)
Risk-free discount rate					50.80%
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Facility exit obligation			3,000,000		3,000,000
Current facility exit obligation as accrued liabilities			600,000		600,000
Facility exit obligation recorded as other long-term liabilities			$ 2,400,000		$ 2,400,000
IPO [Member]
Summary of Business and Significant Accounting Policies (Textual) [Abstract]
Stock issued, Shares		10,350,000
Common stock issue for over-allotment option		1,350,000
Founder [Member]
Summary of Business and Significant Accounting Policies (Textual) [Abstract]
Stock issued, Shares		3,047,500
Common stock issue for over-allotment option		397,500
Stock options and restricted units [Member]
Summary of Business and Significant Accounting Policies (Textual) [Abstract]
Compensation expense recognized, vesting term					4 years
2012 ESPP [Member]
Summary of Business and Significant Accounting Policies (Textual) [Abstract]
Compensation expense recognized, vesting term					6 months
Customer Concentration Risk [Member]
Summary of Business and Significant Accounting Policies (Textual) [Abstract]
Number of customers individually exceeded ten percent of the revenues			0	0	0	0