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Stock-based compensation - Summary of Additional Information Relating to Service-based Options (Details) - Service-based Stock Options - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense $ 590 $ 1,671 $ 2,308 $ 3,219
Intrinsic value of options exercised $ 0 $ 5,620 $ 3,580 $ 2,890
Weighted-average grant date fair value of options granted (in USD per share) $ 3.12 $ 0 $ 5.55 $ 6.81