v2.4.0.6
Convertible Preferred Stock - Additional Information (Detail) (USD $)
 1 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 9 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended 9 Months Ended
Jul. 31, 2012
Dec. 31, 2011
Sep. 30, 2012
Jun. 30, 2010
Jun. 30, 2009
Jun. 30, 2011
Nov. 25, 2009
Installment
Sep. 30, 2012
IPO
Sep. 30, 2012
Cost of Sales
Sep. 30, 2012
Sales and marketing
Sep. 30, 2012
Research and development
Sep. 30, 2012
General and Administrative Expense
Sep. 30, 2012
Interest and Other Income Expense
Apr. 30, 2009
Series C redeemable convertible preferred stock
Dec. 31, 2011
Series C redeemable convertible preferred stock
Jun. 30, 2011
Series C redeemable convertible preferred stock
Jun. 30, 2010
Series C redeemable convertible preferred stock
Apr. 30, 2009
Series C redeemable convertible preferred stock
Note [Member]
Nov. 20, 2009
Series D convertible preferred stock
Dec. 31, 2011
Series D convertible preferred stock
Jun. 30, 2011
Series D convertible preferred stock
Jun. 30, 2010
Series D convertible preferred stock
Nov. 20, 2009
Series D convertible preferred stock
Warrant
Sep. 30, 2012
Series A
Sep. 30, 2012
Series B
Sep. 30, 2012
Convertible preferred stock
Minimum
Preferred Stock [Line Items]                                                    
Preferred Stock, Shares Issued   0 0 0   0               983,606 983,606 983,606 983,606   2,990,635 3,830,379 3,830,379 3,830,379        
Price per share     $ 0.85                     $ 6.10       $ 0.28 $ 17.27       $ 17.27      
Gross proceeding       $ 51,245,000 $ 5,907,000                 $ 6,000,000         $ 51,600,000              
Settlement of related party promissory note for common shares                                   7,868,848                
Price of per common share                                   $ 0.76                
Compensation expense     30,800,000           700,000 2,000,000 3,600,000 24,500,000 300,000         3,800,000                
Common stock repurchased and subsequently cancelled                                     23,510,264       51,852      
Number of share cancelled, held by founder                                     16,480,000              
Shares repurchased and subsequently cancelled from eligible stockholders held by founder price per share                                     $ 2.16              
Strike price of warrant                                             $ 1.25      
Gross proceeding to stockholders and warrant holders   15,000 1,960,000 20,814,000 2,213,000                                   51,600,000      
Maximum percentage of vested shares allowed to be sold by former employees                                             100.00%      
Minimum percentage of vested shares, Required to retain a for current employees                                             30.00%      
Outstanding shares of convertible preferred stock   0 0 0   0   10,462,877             983,606 983,606 983,606     3,830,379 3,830,379 3,830,379        
Aggregate common stock               83,703,016                                    
Holders of shares, entitled to receive dividends of cash in percentage     8.00%                                         8.00% 8.00%  
Dividends declared or paid   0 0 0   0                                        
Number of Common Stock used for Preferred Stock     8                                              
Issuance of common stock upon initial public offering, net of offering costs, value $ 173,300,000   $ 169,799,000                                             $ 50,000,000
Number of annual installments             3                                      
Redemption term     P5Y