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v3.21.4

Stockholders' Equity - Summary of the share activity under the 2015 Plan (Details) - Stock option - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Number of shares |  |  |
Outstanding at the beginning | 32,127 | 35,016 |
Granted | 2,028 | 335 |
Exercised | (798) | (230) |
Forfeited | (7,738) | (1,700) |
Expired | (1,603) | (1,294) |
Outstanding at the end | 24,016 | 32,127 | 35,016
Expected to vest | 2,357 | 8,427 |
Exercisable | 24,016 | 24,611 |
Weighted Average Exercise Price |  |  |
Outstanding at the beginning (in dollars per share) | $ 1.96 | $ 2.00 |
Granted (in dollars per share) | 2.79 | 2.46 |
Exercised (in dollars per share) | 0.73 | 0.62 |
Forfeited (in dollars per share) | 2.97 | 2.86 |
Expired (in dollars per share) | 2.78 | 2.22 |
Outstanding at the end (in dollars per share) | 1.69 | 1.96 | $ 2.00
Expected to vest (in dollars per share) | 2.74 | 2.94 |
Exercisable (in dollars per share) | $ 1.69 | $ 1.65 |
Weighted Average Remaining Contractual Term |  |  |
Weighted Average Remaining Term (in years) | 2 years 7 months 2 days | 5 years 3 days | 5 years 10 days
Vested and expected to vest (in years) | 9 years 4 months 6 days | 7 years 11 months 23 days |
Exercisable (in years) | 2 years 7 months 2 days | 4 years 1 month 13 days |
Aggregate Intrinsic Value |  |  |
Outstanding | $ 25,699 | $ 19,248 | $ 24,634
Exercisable |  | $ 19,248 |

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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + 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)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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