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Employee Stock Plans - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 09, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Price an employee pays for shares as percentage of fair market value | 85.00% |  |  |
Holding period of stock | 1 year |  |  |
Fair value of stock options granted (in dollars per share) | $ 5.79 |  | $ 4.73 |
Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of incremental vesting schedule | 25.00% |  |  |
Incremental vesting schedule period | 4 years |  |  |
Stock options expiry date | 6 years |  |  |
Options awarded under the plans vesting period | 4 years |  |  |
Weighted-average grant-date fair value of stock options granted | $ 300,000 |  | $ 3,000,000.0 |
Aggregate intrinsic value of stock options exercised | 8,900,000 | $ 18,800,000 | 10,900,000 |
Unrecognized compensation cost for non-vested stock option | $ 1,100,000 |  |  |
Compensation cost for non-vested stock options weighted average period | 11 months 19 days |  |  |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options awarded under the plans vesting period | 3 years |  |  |
Share-based compensation arrangement by share-based payment award, remaining contractual terms | 3 years |  |  |
Achievement of an earnings per share target | 70.00% |  |  |
Achievement of total growth in revenue | 30.00% |  |  |
Restricted Stock Units and Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation cost for non-vested stock options weighted average period | 1 year 2 months 12 days |  |  |
Unrecognized compensation cost for restricted stock awards | $ 6,200,000 |  |  |
Total fair value of shares vested during period | 4,600,000 | 3,900,000 | 4,100,000 |
Market value of shares awarded during period | $ 4,300,000 | $ 4,500,000 | $ 5,100,000 |
2014 Stock Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share available for future grant (in shares) | 2,700,000 |  |  |
2019 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share available for future grant (in shares) |  |  |  | 3,100,000
Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options awarded under the plans vesting period | 3 years |  |  |
Minimum | Restricted Stock Units and Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options awarded under the plans vesting period | 1 year |  |  |
Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
ESPP allows qualified employees to purchase shares of common stock | $ 25,000 |  |  |
Shares purchased under ESPP | 2,000,000.0 |  |  |
Options awarded under the plans vesting period | 4 years |  |  |
Maximum | Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of initial grant | 200.00% |  |  |
Maximum | Restricted Stock Units and Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options awarded under the plans vesting period | 4 years |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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