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Stock-Based Compensation - Summary of Stock Option Activity under Plans (Details) - Equity Incentive Plan 2019 - $ / shares shares in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Number of Shares |  |
Balance at the beginning of the year (in shares) | 1,053 | 467
Options granted (in shares) | 409 | 845
Options cancelled and returned to the Plans (in shares) | (20) | (254)
Options exercised (in shares) | (42) | (5)
Effect of business combination (in shares) | 158 |
Balance at the end of the period (in shares) | 1,558 | 1,053
Weighted Average Exercise Prices |  |
Balance at the beginning of the year (in dollars per share) | $ 2.54 | $ 8.20
Options granted (in dollars per share) | 3.00 | 2.65
Options cancelled and returned to the Plans (in dollars per share) | 1.72 | 6.85
Options exercised (in dollars per share) | 2.72 | 1.77
Effect of business combination (in dollars per share) | 10.35 |
Balance at the end of the period (in dollars per share) | $ 3.49 | $ 2.54

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3) -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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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance 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)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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