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Stockholders' equity - ATM Program (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended				12 Months Ended
	Aug. 11, 2020	Oct. 31, 2020	Jun. 30, 2020	Dec. 31, 2019	Aug. 31, 2019	Mar. 31, 2021	Mar. 31, 2020
Class of Warrant or Right [Line Items]
Common stock, par value (in dollars per share)						$ 0.001	$ 0.001
Issuance of stock (value)						$ 286,107
Net proceeds		$ 269,975	$ 107,782	$ 85,598
ATM sales
Class of Warrant or Right [Line Items]
Percentage Of Commission					3.00%
Issuance of stock (value)							$ 4,431
Shares issued during period							287,559
Gross proceeds							$ 4,568
Legal fees							137
Net proceeds							$ 4,431
ATM sales | Common stock
Class of Warrant or Right [Line Items]
Common stock, par value (in dollars per share)	$ 0.001				$ 0.001
Securities offered to the public during the period	$ 350,000
ATM sales | Common stock | Maximum
Class of Warrant or Right [Line Items]
Aggregate offering amount	$ 62,500		$ 30,000		$ 75,000

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