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Net income per share - Reconciliation of Numerator and Denominator in Basic and Diluted Net Income (Loss) Per Common Share Computations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:            
Net income $ 5,724 $ 8,276 $ 447 $ 1,512 $ 14,000 $ 1,959
Denominator:            
Weighted average common shares outstanding - basic (in shares) 50,875,618   49,147,366   50,711,000 49,036,519
Dilutive common equivalent shares from equity awards (in shares) 2,666,106   2,601,071   2,764,988 2,308,278
Weighted average common shares outstanding - diluted (in shares) 53,541,724   51,748,437   53,475,988 51,344,797
Net income per share:            
Basic (in USD per share) $ 0.11   $ 0.01   $ 0.28 $ 0.04
Diluted (in USD per share) $ 0.11   $ 0.01   $ 0.26 $ 0.04
Anti-dilutive securities excluded from diluted EPS:            
Weighted average anti-dilutive shares from outstanding equity awards excluded from diluted earnings per share (in shares) 9,334   857,698   4,667 1,712,824