Convertible Preferred Stock, Tranche Liability and Warrant Liability - Summary of Convertible preferred stock (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Temporary Equity [Line Items]
Shares Authorized	42,066,830	42,066,830
Shares Issued	28,232,672	19,877,219
Shares Outstanding	28,232,672	19,877,219
Carrying Value	$ 174,504	$ 56,653
Liquidation Preference	$ 94,280	$ 62,984
Series A
Temporary Equity [Line Items]
Shares Authorized	711,203	711,203
Shares Issued	477,297	477,297
Shares Outstanding	477,297	477,297
Weighted Average Issuance Price per Share	$ 2.24	$ 2.24
Carrying Value	$ 1,067	$ 1,067
Liquidation Preference	$ 1,067	$ 1,067
Series A-1
Temporary Equity [Line Items]
Shares Authorized	11,898,177	11,898,177
Shares Issued	7,985,305	7,537,879
Shares Outstanding	7,985,305	7,537,879
Weighted Average Issuance Price per Share	$ 2.27	$ 2.24
Carrying Value	$ 22,963	$ 16,333
Liquidation Preference	$ 18,097	$ 16,847
Series B
Temporary Equity [Line Items]
Shares Authorized	29,457,450	29,457,450
Shares Issued	19,770,070	11,862,043
Shares Outstanding	19,770,070	11,862,043
Weighted Average Issuance Price per Share	$ 3.80	$ 3.80
Carrying Value	$ 150,474	$ 39,253
Liquidation Preference	$ 75,116	$ 45,070