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Stock-based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |  |  |
Options to Purchase Common Stock, Outstanding, beginning | 22,088,726 | 27,263,775 |
Options to Purchase Common Stock, Granted | 0 | 90,597 |
Options to Purchase Common Stock, Exercised | (3,708,786) | (2,771,051) |
Options to Purchase Common Stock, Forfeited | (857,579) | (1,508,243) |
Options to Purchase Common Stock, Expired | (177,033) | (986,352) |
Options to Purchase Common Stock, Outstanding, ending | 17,345,328 | 22,088,726 | 27,263,775
Options to Purchase Common Stock, Options vested and exercisable | 15,112,440 | 14,739,214 |
Weighted- Average Exercise Price per Share, Outstanding, beginning | $ 1.03 | $ 0.97 |
Weighted- Average Exercise Price per Share, Granted |  | 1.41 |
Weighted- Average Exercise Price per Share, Exercised | 1.00 | 0.36 |
Weighted- Average Exercise Price per Share, Forfeited | 1.21 | 1.26 |
Weighted- Average Exercise Price per Share, Expired | 1.16 | 1.05 |
Weighted- Average Exercise Price per Share, Outstanding, ending | 1.03 | 1.03 | $ 0.97
Weighted- Average Exercise Price per Share, Options vested and exercisable | 1.01 | 0.97 |
Weighted- Average Grant Date Fair Value per Share, Outstanding, beginning | 0.53 | 0.50 |
Weighted- Average Grant Date Fair Value per Share, Granted |  | 0.78 |
Weighted- Average Grant Date Fair Value per Share, Exercised | 0.51 |  |
Weighted- Average Grant Date Fair Value per Share, Forfeited | 0.60 |  |
Weighted- Average Grant Date Fair Value per Share, Expired | 0.31 |  |
Weighted- Average Grant Date Fair Value per Share, Outstanding, ending | 0.54 | 0.53 | $ 0.50
Weighted- Average Grant Date Fair Value per Share, Options vested and exercisable | $ 0.52 | $ 0.49 |
Weighted- Average Remaining Contract Life (In Years), Outstanding | 6 years 10 days | 7 years 1 month 13 days | 7 years 11 months 12 days
Weighted- Average Remaining Contract Life (In Years), Granted |  |  |
Weighted- Average Remaining Contract Life (In Years), Exercised | 4 years 3 months 25 days | 3 years 2 months 15 days |
Weighted- Average Remaining Contract Life (In Years), Forfeited | 3 days |  |
Weighted- Average Remaining Contract Life (In Years), Expired |  |  |
Weighted- Average Remaining Contract Life (In Years), Outstanding, Ending balance | 6 years 10 days | 7 years 1 month 13 days | 7 years 11 months 12 days
Weighted- Average Remaining Contract Life (In Years), Options vested and exercisable | 5 years 10 months 24 days | 6 years 9 months 29 days |
Aggregate Intrinsic Value, Outstanding | $ 195,111 | $ 85,853 | $ 11,941
Aggregate Intrinsic Value, Granted | 0 |  |
Aggregate Intrinsic Value, Exercised | 41,822 | 2,565 |
Aggregate Intrinsic Value, Forfeited | 9,131 |  |
Aggregate Intrinsic Value, Expired | 1,969 |  |
Aggregate Intrinsic Value, Exercised, Ending Balance | 195,111 | 85,853 | $ 11,941
Aggregate Intrinsic Value, Options vested and exercisable | $ 170,320 | $ 57,660 |

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest exercisable options that may be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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