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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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