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, 2018
Sep. 30, 2017
Mar. 31, 2018
Number of Shares (in shares)      
Beginning Balance (shares) 9,741,969    
Granted (shares) 1,240,425 872,000  
Forfeited / Cancelled (shares) (964,863)    
Exercised (shares) (261,201)    
Ending Balance (shares) 9,756,330   9,741,969
Vested and expected to vest (net of estimated forfeitures) (shares) 8,298,074    
Exercisable (shares) 4,836,214    
Weighted Average Exercise Price ($ per share)      
Options outstanding (in dollars per share) $ 2.08    
Granted (in dollars per share) 1.67    
Forfeited/Cancelled (in dollars per share) 4.71    
Exercised (in dollars per share) 0.88    
Options outstanding (in dollars per share) 1.80   $ 2.08
Vested and expected to vest (net of estimated forfeitures) (in dollars per share) 1.89    
Exercisable (in dollars per share) $ 2.37    
Weighted Average Remaining Contractual Life (in years)      
Outstanding 6 years 7 months 21 days   7 years 9 months 26 days
Vested and expected to vest (net of estimated forfeitures) 7 years 5 months 9 days    
Exercisable, September 30, 2018 6 years 7 months 21 days    
Aggregate Intrinsic Value (in thousands)      
Outstanding $ 380   $ 6,286
Vested and expected to vest (net of estimated forfeitures) 1,205    
Exercisable, September 30, 2018 $ 381