Quarterly report pursuant to sections 13 or 15(d)

Description of Stock Plans - Additional Information (Detail)

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Description of Stock Plans - Additional Information (Detail)
6 Months Ended 1 Months Ended
Sep. 30, 2013
Sep. 10, 2012
Before Amendment
Sep. 10, 2012
After Amendment
Feb. 12, 2008
2007 Employee, Director and Consultant Stock Plan equity compensation plan
Mar. 07, 2008
2007 Employee, Director and Consultant Stock Plan equity compensation plan
Any fiscal year
Sep. 27, 2007
2007 Employee, Director and Consultant Stock Plan equity compensation plan
Maximum
Sep. 30, 2013
Stock Option Plan 2011
May 23, 2012
Stock Option Plan 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Individual grant limits 500,000              
Number of shares authorized under stock compensation plan   4,000,000 20,000,000          
Shares reserved for future issuance               20,000,000
Number of shares available for issuance       7,000,000 1,100 3,000,000 18,658,333  
Option plan, term           10 years