Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Expense (Details)

v3.19.1
Stock-Based Compensation - Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
LTIPs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 3,938 $ 2,551 $ 2,528
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 0 0 42
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 8,928 5,106 2,150
Cost of sales | LTIPs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 1,254 654 729
Cost of sales | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 0 0 21
Cost of sales | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 1,502 865 634
Selling, general and administrative expenses | LTIPs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 2,413 1,695 1,620
Selling, general and administrative expenses | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 0 0 20
Selling, general and administrative expenses | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 7,338 4,195 1,490
Research and development | LTIPs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 271 202 179
Research and development | Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense 0 0 1
Research and development | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 88 $ 46 $ 26