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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