Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans - Summary of Options Granted Under All Equity Plans (Details)

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Description of Stock Plans - Summary of Options Granted Under All Equity Plans (Details) - Stock Option - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Number of Shares (in shares)      
Beginning Balance (shares) 9,735,778    
Granted (shares) 872,000 1,037,000  
Forfeited / Cancelled (shares) (757,934)    
Exercised (shares) (24,211)    
Ending Balance (shares) 9,825,633   9,735,778
Vested and expected to vest (net of estimated forfeitures) (shares) 8,753,144    
Exercisable (shares) 4,162,328    
Weighted Average Exercise Price ($ per share)      
Options outstanding (in dollars per share) $ 2.56    
Granted (in dollars per share) 1.06    
Forfeited/Cancelled (in dollars per share) 2.19    
Exercised (in dollars per share) 0.71    
Options outstanding (in dollars per share) 2.46   $ 2.56
Vested and expected to vest (net of estimated forfeitures) (in dollars per share) 2.64    
Exercisable (in dollars per share) $ 4.23    
Weighted Average Remaining Contractual Life (in years)      
Outstanding 7 years 8 months 15 days   7 years 11 months 12 days
Vested and expected to vest (net of estimated forfeitures) 7 years 6 months 10 days    
Exercisable, September 30, 2017 6 years 1 month 7 days    
Aggregate Intrinsic Value (in thousands)      
Outstanding $ 3,320   $ 801
Vested and expected to vest (net of estimated forfeitures) 2,727    
Exercisable, September 30, 2017 $ 536