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Stock-based compensation - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2018
Service-based Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized stock-based compensation cost |  | $ 1,500,000 |  |
Unrecognized stock-based compensation cost, expected weighted-average period of recognition |  | 2 years 2 months 12 days |  |
Maximum contractual life |  | 10 years |  |
Expected dividend yield | 0.00% | 0.00% | 0.00% | 0.00%
Stock-based compensation expense | $ 590,000 | $ 1,671,000 | $ 2,308,000 | $ 3,219,000
Performance-based and Market-based Stock Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized stock-based compensation cost |  | 0 |  |
Stock-based compensation expense | $ 0 | $ 0 | $ 0 | $ 1,168,000
RSA |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unvested shares outstanding (in shares) |  | 1,190,320 |  |
RSAs and RSUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Unrecognized stock-based compensation cost, expected weighted-average period of recognition |  | 2 years 2 months 12 days |  |
Unvested shares outstanding (in shares) | 2,786,398 | 2,289,615 | 2,311,768 | 2,036,124
Unrecognized stock-based compensation cost |  | $ 25,600,000 |  |
Stock-based compensation expense | $ 3,093,000 | 18,012,000 | $ 13,181,000 | $ 12,434,000
RSAs and RSUs | Cost of Sales |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | 200,000 |  |
RSAs and RSUs | Selling, General and Administrative Expenses |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  | $ 17,800,000 |  |
2016 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized (in shares) |  | 14,483,591 |  |
Shares available for grant (in shares) |  | 7,667,891 |  |
2014 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of options and awards outstanding (in shares) |  | 1,061,972 |  |

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