Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Grants outside of 2000 Plan and 2017 Plan (Details)

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Stock-Based Compensation - Grants outside of 2000 Plan and 2017 Plan (Details) - shares
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Mar. 31, 2017
Stock options      
Class of Stock      
Options outstanding (in shares) 310,537 310,537 314,537
Granted (in shares) 0 0  
Stock options | Non-qualified stock options      
Class of Stock      
Portion vesting one year after the issuance date (as a percent)   25.00%  
Vesting period after one year of grant   1 year  
Vesting period of awards after issuance date   48 months  
Portion vesting on first day of each month after one year from the issuance date (as a percent)   2.083%  
Vesting period   4 years  
Expiration Term   10 years  
Stock options | Non-qualified stock options | Vice President, Manufacturing      
Class of Stock      
Options outstanding (in shares) 88,930 88,930  
Restricted stock units | Vice President, Manufacturing      
Class of Stock      
Restricted stock units outstanding (in shares) 11,115 11,115