XML 86 R67.htm IDEA: XBRL DOCUMENT v3.21.1
Income taxes - Valuation allowance for deferred tax assets (Details)
 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Deferred tax assets, Valuation allowance    
Valuation allowance as of beginning of year $ 17,329,000 $ 9,396,000
Increases recorded to income tax provision 22,624,000 8,047,000
Increases recorded to income tax provision for equity 76,000  
Decrease recorded to income tax provision for equity   (114,000)
Valuation allowance as of end of year 40,028,000 17,329,000
Accrued interest or penalties related to uncertain tax positions 0 0
Income tax benefit $ 0 $ 0
Number of pending tax examination 0