Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Convertible Preferred Shares - Summary of Convertible Preferred Shares (Detail)

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Convertible Preferred Shares - Summary of Convertible Preferred Shares (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Temporary Equity [Line Items]    
Carrying Value $ 272,815 $ 249,081
Series A Convertible Preferred Shares [Member]    
Temporary Equity [Line Items]    
Number of shares Authorized 20,418,209 20,418,209
Number of shares Issued and outstanding 20,418,209 20,418,209
Carrying Value $ 9,000  
Liquidation preference $ 11,682  
Series B Convertible Preferred Shares [Member]    
Temporary Equity [Line Items]    
Number of shares Authorized 15,906,053 15,906,053
Number of shares Issued and outstanding 15,906,053 15,906,053
Carrying Value $ 66,348 $ 66,348
Liquidation preference $ 89,659  
Series B-1 Convertible Preferred Shares [Member]    
Temporary Equity [Line Items]    
Number of shares Authorized 3,032,940 3,032,940
Number of shares Issued and outstanding 3,032,940 3,032,940
Carrying Value $ 12,500 $ 12,500
Liquidation preference $ 13,693  
Series C Convertible Preferred Shares [Member]    
Temporary Equity [Line Items]    
Number of shares Authorized 28,973,439 28,973,439
Number of shares Issued and outstanding 28,216,005 28,216,005
Carrying Value $ 161,233 $ 161,233
Liquidation preference $ 186,954  
Series C-1 Convertible Preferred Shares [Member]    
Temporary Equity [Line Items]    
Number of shares Authorized 15,191,550 0
Number of shares Issued and outstanding 2,699,114 0
Carrying Value $ 23,734 $ 0
Liquidation preference $ 26,218