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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Sep. 23, 2021 | Sep. 30, 2021 | Dec. 31, 2012
Share-Based Compensation [Line Items] |  |  |
Unrecognized stock-based compensation expense related to stock options |  | $ 2.6 |
Options and RSUs | Non-employee director |  |  |
Share-Based Compensation [Line Items] |  |  |
Service period for award vesting (in years) |  | 1 year |
Stock options |  |  |
Share-Based Compensation [Line Items] |  |  |
Service period for award vesting (in years) |  | 4 years |
Weighted-average period for recognition of stock-based compensation expense (in years) |  | 2 years 3 months 18 days |
Stock options | Awards granted after December 5, 2012 |  |  |
Share-Based Compensation [Line Items] |  |  |
Award expiration period (in years) |  | 8 years |
Stock options | Awards granted prior to December 5, 2012 |  |  |
Share-Based Compensation [Line Items] |  |  |
Award expiration period (in years) |  | 10 years |
RSUs |  |  |
Share-Based Compensation [Line Items] |  |  |
Service period for award vesting (in years) |  | 4 years |
Unrecognized stock-based compensation expense related to RSUs |  | $ 68.2 |
Weighted-average period for recognition of stock-based compensation expense (in years) |  | 2 years 7 months 6 days |
2017 Plan |  |  |
Share-Based Compensation [Line Items] |  |  |
Shares available for grant |  | 3,600,000 |
2012 Purchase Plan |  |  |
Share-Based Compensation [Line Items] |  |  |
Number of shares authorized |  |  | 2,000,000
Number of additional shares authorized | 2,000,000 |  |
Maximum number of shares per participant per offering period | 5,000 |  |
Shares available for issuance under the Plan |  | 100,000 |

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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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