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Stockholders' Equity - Convertible preferred stock (Details) $ in Thousands			12 Months Ended
	Jul. 25, 2018 shares	Jul. 09, 2018	Mar. 31, 2019 USD ($) shares	Mar. 31, 2020 USD ($)
Convertible preferred stock
Forward stock split ratio for each common stock		0.100534
Convertible preferred stock
Convertible preferred stock
Conversion of shares (in shares) \| shares	19,157,360		(1,925,968)
Forward stock split ratio for each common stock		0.100534
Preferred stock outstanding \| $			$ 0	$ 0