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Income taxes - Components of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Deferred tax assets:      
Federal net operating loss carryforwards $ 7,083 $ 2,450  
Foreign net operating loss carryforwards 22,195 9,092  
State net operating loss carryforwards 2,358 1,054  
Research and development credits 787    
Property, plant and equipment 5,068 5,499  
Capitalized start-up costs 1,597 1,748  
Stock compensation 4,838 2,526  
Accrued expenses 739 341  
Lease liability 8,462 8,705  
Total deferred tax assets 53,127 31,415  
Deferred tax liabilities:      
Right-to-use asset (13,090) (13,998)  
Other (9) (88)  
Total deferred tax liabilities (13,099) (14,086)  
Valuation allowance (40,028) $ (17,329) $ (9,396)
Deferred tax assets operating loss carryforwards      
Federal net operating loss carryforwards having indefinite expiration period 33,731    
Foreign net operating loss carryforwards having indefinite expiration period 116,815    
Federal research and development carryforwards 687    
State research and development carryforwards 126    
State net operating loss carryforwards, expires between 2039 and 2040 $ 37,311