Common Stock - Summary Of Common Stock Capital Shares Reserved For Future Issuance (Detail)	Apr. 30, 2021 shares
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total shares of common stock reserved	132,298,260
Common stock reserved for Earnout [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total shares of common stock reserved	9,000,000
Stock options issued and outstanding [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total shares of common stock reserved	29,795,964
Common stock warrants outstanding [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total shares of common stock reserved	43,895,087
Shares available for grant under 2021 Equity Incentive Plan [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total shares of common stock reserved	41,429,526
Shares available for grant under 2021 ESPP [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Total shares of common stock reserved	8,177,683