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Redeemable Convertible Preferred Stock - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended
Jun. 08, 2021
vote
Jun. 30, 2021
USD ($)
shares
Mar. 31, 2022
$ / shares
shares
Mar. 31, 2021
USD ($)
vote
board_of_director
series
$ / shares
shares
Mar. 31, 2020
shares
Mar. 31, 2019
shares
Aug. 31, 2012
USD ($)
$ / shares
shares
Temporary Equity [Line Items]              
Number of outstanding series of redeemable convertible preferred stock | series       3      
Redeemable convertible preferred stock, par value (in dollars per share) | $ / shares     $ 0.001 $ 0.001      
Conversion of stock conversion ratio   1          
Reclassifications of temporary to permanent equity | $   $ 81,500          
Redeemable convertible preferred stock issued (in shares)     0 76,287,000      
Redeemable convertible preferred stock outstanding (in shares)     0 76,287,000 76,287,000 76,249,000  
Common stock, number of votes per share | vote       1      
Temporary equity, election of board members, shares outstanding threshold (in shares)       2,000,000      
Temporary equity, shares outstanding threshold met, number of board of director members entitled to elect | board_of_director       2      
Common stock, holding majority, number of board of director members entitled to elect | board_of_director       2      
Conversion price (in dollars per share) | $ / shares       $ 2.41      
Aggregate offering price conversion trigger | $       $ 50,000      
Common stock warrants (in shares)     766,000 250,000      
Redeemable convertible preferred stock warrants              
Temporary Equity [Line Items]              
Common stock warrants (in shares)             38,322
Exercise price called by warrants (in dollars per share) | $ / shares             $ 0.65
Warrants and rights outstanding | $             $ 14
Redeemable convertible preferred stock warrants | Measurement Input, Expected Dividend Rate | Valuation Technique, Option Pricing Model              
Temporary Equity [Line Items]              
Warrant, measurement input             0
Redeemable convertible preferred stock warrants | Measurement Input, Price Volatility | Valuation Technique, Option Pricing Model              
Temporary Equity [Line Items]              
Warrant, measurement input             0.55
Redeemable convertible preferred stock warrants | Measurement Input, Risk Free Interest Rate | Valuation Technique, Option Pricing Model              
Temporary Equity [Line Items]              
Warrant, measurement input             0.0113
Redeemable convertible preferred stock warrants | Measurement Input, Expected Term | Valuation Technique, Option Pricing Model              
Temporary Equity [Line Items]              
Warrants and rights outstanding, term             7 years
Common Class B              
Temporary Equity [Line Items]              
Conversion of stock, shares issued (in shares)   76,286,618          
Conversion of stock conversion ratio 1            
Common stock, number of votes per share | vote 10            
Series A              
Temporary Equity [Line Items]              
Redeemable convertible preferred stock issued (in shares)       27,636,000      
Redeemable convertible preferred stock outstanding (in shares)       27,636,000      
Temporary equity, liquidation preference per share (in dollars per share) | $ / shares       $ 0.3892      
Temporary equity, dividend rate (in dollars per share) | $ / shares       $ 0.03115      
Series B              
Temporary Equity [Line Items]              
Redeemable convertible preferred stock issued (in shares)       26,314,000      
Redeemable convertible preferred stock outstanding (in shares)       26,314,000      
Temporary equity, liquidation preference per share (in dollars per share) | $ / shares       $ 0.6488925      
Temporary equity, dividend rate (in dollars per share) | $ / shares       $ 0.0519      
Series C              
Temporary Equity [Line Items]              
Redeemable convertible preferred stock issued (in shares)       22,337,000      
Redeemable convertible preferred stock outstanding (in shares)       22,337,000      
Temporary equity, liquidation preference per share (in dollars per share) | $ / shares       $ 2.4104      
Temporary equity, dividend rate (in dollars per share) | $ / shares       $ 0.19285