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Stock-Based Compensation - Summary of RSU Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Shares Issuable Under RSUs |  |  |
Options exercisable as of December 31, 2021 | 1,871,327 |  |
Weighted Average Exercise Price |  |  |
Options exercisable as of December 31, 2021 | $ 11.64 |  |
RSU [Member] |  |  |
Shares Issuable Under RSUs |  |  |
Outstanding, beginning balance |  | 3,056 |
Granted | 20,000 |  |
RSUs Vested |  | (3,056) |
Outstanding, ending balance | 20,000 |  | 3,056
RSUs vested and expected to vest as of December 31, 2021 | 20,000 |  |
Weighted Average Exercise Price |  |  |
Outstanding, beginning balance |  | $ 66.96 |
Granted | $ 5.07 |  |
RSUs Vested |  | $ 66.96 |
Outstanding, ending balance | 5.07 |  | $ 66.96
RSUs vested and expected to vest as of December 31, 2021 | $ 5.07 |  |
Weighted Average Remaining Contractual Term (In years) |  |  |
Outstanding as of January 1, 2020 | 9 years 9 months 18 days |  | 9 years 2 months 12 days
Granted | 9 years 9 months 18 days |  |
RSUs Vested |  | 9 years 2 months 12 days |
RSUs vested and expected to vest as of December 31, 2021 | 9 years 9 months 18 days |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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