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Stock-based compensation - Summary of Additional Information Relating to Performance-based and Market-based Stock Options (Details) - Performance-based and Market-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 $ 0 $ 0 $ 0 $ 1,168
Intrinsic value of options exercised $ 419 $ 3,117 $ 609 $ 8,669
Weighted-average grant date fair value of options granted (in USD per share) $ 0 $ 0 $ 0 $ 0