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
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Number of Shares (in shares)      
Beginning Balance (shares) 9,741,969    
Granted (shares) 1,198,425 326,500  
Forfeited / Cancelled (shares) (388,570)    
Exercised (shares) (150,001)    
Ending Balance (shares) 10,401,823   9,741,969
Vested and expected to vest (net of estimated forfeitures) (shares) 8,549,126    
Exercisable (shares) 4,642,180    
Weighted Average Exercise Price ($ per share)      
Options outstanding (in dollars per share) $ 2.08    
Granted (in dollars per share) 1.68    
Forfeited/Cancelled (in dollars per share) 9.59    
Exercised (in dollars per share) 0.79    
Options outstanding (in dollars per share) 1.77   $ 2.08
Vested and expected to vest (net of estimated forfeitures) (in dollars per share) 1.88    
Exercisable (in dollars per share) $ 2.43    
Weighted Average Remaining Contractual Life (in years)      
Outstanding 7 years 11 months 27 days   7 years 9 months 26 days
Vested and expected to vest (net of estimated forfeitures) 7 years 9 months 7 days    
Exercisable, June 30, 2018 6 years 11 months 9 days    
Aggregate Intrinsic Value (in thousands)      
Outstanding $ 2,960   $ 6,286
Vested and expected to vest (net of estimated forfeitures) 2,268    
Exercisable, June 30, 2018 $ 743