v3.26.1
Convertible Preferred Stock and Stockholders' Deficit - Summary of Stock Option Activity (Detail) - 2010 Plan [Member]
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2026
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Outstanding Options, Outstanding, Beginning balance | shares 13,646,881
Number of Outstanding Options, Granted | shares 425,168
Number of Outstanding Options, Expired | shares (460,500)
Number of Outstanding Options, Outstanding, Ending balance | shares 13,611,549
Number of Outstanding Options, Vested and expected to vest at June 30, 2026 | shares 13,587,493
Number of Outstanding Options, Exercisable at June 30, 2026 | shares 12,839,159
Weighted Average Exercise, Outstanding, Beginning balance | $ / shares $ 0.54
Weighted Average Exercise, Granted | $ / shares 0.18
Weighted Average Exercise Price, Expired | $ / shares 2.93
Weighted Average Exercise, Outstanding, Ending balance | $ / shares 0.45
Weighted Average Exercise, Vested and expected to vest at June 30, 2026 | $ / shares 0.45
Weighted Average Exercise, Exercisable at June 30, 2026 | $ / shares $ 0.46
Weighted Average Remaining Contractual Term (in years), Options Outstanding Ending Balance 6 years 25 days
Weighted Average Remaining Contractual Term (in years), Vested and expected to vest at June 30, 2026 6 years 21 days
Weighted Average Remaining Contractual Term (in years), Exercisable at June 30, 2026 5 years 10 months 24 days
Aggregate Intrinsic Value, Outstanding at June 30, 2026 | $ $ 389
Aggregate Intrinsic Value, Vested and expected to vest at June 30, 2026 | $ 388
Aggregate Intrinsic Value, Exercisable at June 30, 2026 | $ $ 363