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Restructuring and other related costs - Restructuring expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2018
Restructuring and Related Activities [Abstract]          
Property, plant and equipment impairment     $ 2,097    
Inventory disposal     343    
Employee severance and related expenses $ 600   23 $ 0  
Other costs, including other asset write-offs 1,959   178 1,751  
Acceleration of rent expense 16,106   0 0  
Acceleration of depreciation expense 5,377     0  
Gain from extinguishment of lease liabilities 1,866     7,733  
Total $ 22,176 $ 0 $ 2,641 $ (5,982) $ 0