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) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended 1 Months Ended
Sep. 30, 2012
Sep. 10, 2012
Before Amendment
Sep. 10, 2012
After Amendment
Sep. 30, 2012
2007 Employee, Director and Consultant Stock Plan equity compensation plan
Feb. 12, 2008
2007 Employee, Director and Consultant Stock Plan equity compensation plan
Sep. 27, 2007
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, 2012
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                  
Maximum number of shares or equivalents of common stock that may be granted   4,000,000 20,000,000   7,000,000 3,000,000 1,100      
Shares reserved for future issuance                   20,000,000
Number of shares available for issuance                 15,916,667  
Share Options Exercisable 0     4,798,000            
Option plan, term               10 years    
Total unrecognized compensation cost related to nonvested share based compensation       $ 0