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Stockholders' Equity - Stock Options and Employee Stock Purchase Plan - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Class Of Stock [Line Items]      
Issuances of common stock from stock option exercises, Shares 245,271 116,001 205,684
Weighted-average remaining contractual term of stock options exercisable 5 years 10 months 21 days    
Weighted-average remaining contractual term of stock options outstanding 5 years 10 months 21 days    
Number of common stock shares approved under ESPP 17,420,514    
Expected life of options 6 years 6 years 6 years
Shares issued under ESPP 52,557,000    
2012 Plan [Member]      
Class Of Stock [Line Items]      
Issuances of common stock from stock option exercises, Shares 1,955,016 2,966,778  
Remaining options vest 36 months    
2016 Employee Stock Purchase Plan [Member]      
Class Of Stock [Line Items]      
Number of common stock shares approved under ESPP 1,500,000    
Employee subscription rate 15.00%    
Compensation amount per employee $ 25,000    
Number of shares per employee 10,000    
Fair market value at discount 85.00%    
Purchase period 6 months    
Initial offering period 2016-09    
Description of plan 0    
Expected life of options 6 months    
Shares available for issuance 1,447,443    
Stock options [Member] | 2012 Plan [Member]      
Class Of Stock [Line Items]      
Award vesting conditions stock options generally vest on (i) the one year anniversary of the grant date, (ii) quarterly over a three year period, or (iii) over a four-year period with a quarter vesting on either the one year anniversary of employment or the one year anniversary of the vesting commencement date    
Stock options [Member] | 2016 Employee Stock Purchase Plan [Member]      
Class Of Stock [Line Items]      
Number of common stock shares approved under ESPP 1,447,443,000