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Stockholders' Equity - Additional Information (Detail) - USD ($)
 12 Months Ended
Apr. 29, 2015
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Nov. 13, 2014
Stockholders Equity [Line Items]          
Weighted-average grant-date fair value of stock options granted     $ 10.18 $ 16.20  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value   $ 0 $ 0 $ 0  
Shares, Granted   420,189      
Number of shares cancelled   14,949      
Stock-based compensation plans expired terms   May 02, 2007      
Contractual life of options, in years   10 years      
Vesting period of shares granted by option upon election to board   2 years      
Compensation expense recognized     $ 100,000 100,000  
Common stock, shares issued   14,107,126 9,624,275    
Sale of stock, price per share         $ 11.00
Proceeds From Issuance Of Common Stock $ 22,300,000        
Cowen and Company, LLC          
Stockholders Equity [Line Items]          
Common stock, shares issued 4,000,000        
Sale of stock, price per share $ 6.00        
Proceeds From Issuance Of Common Stock $ 22,300,000        
Maximum          
Stockholders Equity [Line Items]          
Compensation expense recognized   $ 100,000      
Stock Options          
Stockholders Equity [Line Items]          
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures   $ 600,000      
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)   2 years 4 months 24 days      
Stock options granted in period   0      
Stock Options | Minimum          
Stockholders Equity [Line Items]          
Vesting period, in years   3 years      
Stock Options | Maximum          
Stockholders Equity [Line Items]          
Vesting period, in years   5 years      
Restricted Stock and Stock Awards          
Stockholders Equity [Line Items]          
Unrecognized compensation cost for unvested employee stock-based compensation awards outstanding, net of forfeitures   $ 2,600,000      
Weighted-average period over which unrecognized compensation expense is expected to be recognized (years)   1 year 9 months 18 days      
Total fair value of restricted stock granted   $ 2,600,000 $ 5,600,000 4,500,000  
Total fair value of restricted stock granted for bonuses and severance       500,000  
Total fair value of restricted stock vested   $ 1,700,000 $ 3,100,000 3,700,000  
Total fair value of restricted stock granted for bonuses and severance       $ 500,000  
Vesting period, in years   3 years      
Performance-Based Restricted Stock          
Stockholders Equity [Line Items]          
Shares, Granted   0 38,021 40,201  
Restricted Stock Units (RSUs)          
Stockholders Equity [Line Items]          
Number of shares cancelled   6,666      
2007 Director Stock Option Plan          
Stockholders Equity [Line Items]          
Number of shares granted by option upon election to the board   1,000      
Number of shares awarded annually   300      
Grant date value of shares granted by option upon election to board   $ 40,000      
Number of shares authorized for issuance under the plan   35,505      
2007 Stock Incentive Plan          
Stockholders Equity [Line Items]          
Number of shares authorized for issuance under the plan   195,194      
Employee Stock Purchase Plan          
Stockholders Equity [Line Items]          
Number of shares authorized for issuance under the plan   0      
Percentage of purchase discount   15.00%