Quarterly report pursuant to Section 13 or 15(d)

Description of Stock Plans - Summary of Exercise Price (Details)

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Description of Stock Plans - Summary of Exercise Price (Details)
 9 Months Ended
Dec. 31, 2019
$ / shares
shares
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Options Outstanding, Number of Shares (in shares) | shares 8,300,438
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 2.36
Options Outstanding, Weighted Average Remaining Life 7 years 1 month 25 days
Options Exercisable, Number of Shares (in shares) | shares 5,119,274
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 2.15
$0.51 - 1.00  
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Range of exercise price, lower limit (in dollars per share) 0.51
Range of exercise price, upper limit (in dollars per share) $ 1.00
Options Outstanding, Number of Shares (in shares) | shares 1,591,790
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 0.73
Options Outstanding, Weighted Average Remaining Life 6 years 10 months 3 days
Options Exercisable, Number of Shares (in shares) | shares 828,032
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 0.73
$1.01 - 1.50  
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Range of exercise price, lower limit (in dollars per share) 1.01
Range of exercise price, upper limit (in dollars per share) $ 1.5
Options Outstanding, Number of Shares (in shares) | shares 1,863,050
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 1.29
Options Outstanding, Weighted Average Remaining Life 6 years 7 months 7 days
Options Exercisable, Number of Shares (in shares) | shares 1,718,255
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 1.30
$1.51 - 2.00  
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Range of exercise price, lower limit (in dollars per share) 1.51
Range of exercise price, upper limit (in dollars per share) $ 2
Options Outstanding, Number of Shares (in shares) | shares 1,024,212
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 1.67
Options Outstanding, Weighted Average Remaining Life 8 years 3 months 22 days
Options Exercisable, Number of Shares (in shares) | shares 492,253
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 1.66
$2.01 - 2.50  
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Range of exercise price, lower limit (in dollars per share) 2.01
Range of exercise price, upper limit (in dollars per share) $ 2.50
Options Outstanding, Number of Shares (in shares) | shares 560,778
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 2.23
Options Outstanding, Weighted Average Remaining Life 8 years 3 months 18 days
Options Exercisable, Number of Shares (in shares) | shares 250,156
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 2.21
$2.51 - 3.00  
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Range of exercise price, lower limit (in dollars per share) 2.51
Range of exercise price, upper limit (in dollars per share) $ 3.00
Options Outstanding, Number of Shares (in shares) | shares 535,958
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 2.59
Options Outstanding, Weighted Average Remaining Life 4 years 4 months 3 days
Options Exercisable, Number of Shares (in shares) | shares 535,958
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 2.59
$3.51 - 4.00  
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Range of exercise price, lower limit (in dollars per share) 3.51
Range of exercise price, upper limit (in dollars per share) $ 4.00
Options Outstanding, Number of Shares (in shares) | shares 1,812,650
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 3.89
Options Outstanding, Weighted Average Remaining Life 8 years 1 month 25 days
Options Exercisable, Number of Shares (in shares) | shares 680,783
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 3.93
$4.01 - 4.50  
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Range of exercise price, lower limit (in dollars per share) 4.01
Range of exercise price, upper limit (in dollars per share) $ 4.50
Options Outstanding, Number of Shares (in shares) | shares 475,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.13
Options Outstanding, Weighted Average Remaining Life 4 years 9 months 10 days
Options Exercisable, Number of Shares (in shares) | shares 475,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.13
$4.51 - 5.00  
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Range of exercise price, lower limit (in dollars per share) 4.51
Range of exercise price, upper limit (in dollars per share) $ 5.00
Options Outstanding, Number of Shares (in shares) | shares 60,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 4.65
Options Outstanding, Weighted Average Remaining Life 3 years 2 months 25 days
Options Exercisable, Number of Shares (in shares) | shares 60,000
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 4.65
$5.01 and over  
Employee Stock Ownership Plan E S O P Disclosures [Line Items]  
Exercise price (in dollars per share) $ 5.01
Options Outstanding, Number of Shares (in shares) | shares 377,000
Options Outstanding, Weighted Average Exercise Price (in dollars per share) $ 6.32
Options Outstanding, Weighted Average Remaining Life 9 years 10 days
Options Exercisable, Number of Shares (in shares) | shares 78,837
Options Exercisable, Weighted Average Exercise Price (in dollars per share) $ 5.96