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Stockholders' Equity - Additional Information 1 (Detail) - USD ($)
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Class Of Stock [Line Items]    
Issuances of common stock from stock option exercises, Shares 25,503 60,522
Weighted-average remaining contractual term of options exercisable 7 years 6 months 7 days  
Weighted-average remaining contractual term of options outstanding 7 years 6 months 7 days  
Total unrecognized compensation cost related to unvested stock option grants $ 15,200,000  
Research and development expense [Member]    
Class Of Stock [Line Items]    
Total employee stock-based compensation recorded as operating expenses 0 $ 4,000
General and administrative expense [Member]    
Class Of Stock [Line Items]    
Total employee stock-based compensation recorded as operating expenses $ 103,000 $ 129,000
2012 Plan [Member]    
Class Of Stock [Line Items]    
Issuances of common stock from stock option exercises, Shares 1,762,641 266,801
Stock options [Member]    
Class Of Stock [Line Items]    
Total employee stock-based compensation recorded as operating expenses $ 1,677,000 $ 1,405,000
Total unrecognized compensation cost related, weighted average period 2 years 8 months 23 days  
Stock options [Member] | Research and development expense [Member]    
Class Of Stock [Line Items]    
Total employee stock-based compensation recorded as operating expenses $ 349,000 248,000
Stock options [Member] | General and administrative expense [Member]    
Class Of Stock [Line Items]    
Total employee stock-based compensation recorded as operating expenses $ 1,328,000 $ 1,157,000
Stock options [Member] | 2012 Plan [Member]    
Class Of Stock [Line Items]    
Award vesting conditions stock options generally vest (i) on the one year anniversary of the grant date, (2) quarterly over a three year period, or (3) over a four-year period, with 25% vesting on either the one year anniversary of employment or the one year anniversary of the vesting commencement date  
Stock options [Member] | 2012 Plan [Member] | Yearly Vesting [Member]    
Class Of Stock [Line Items]    
Award vesting percentage 25.00%