Stock-Based Compensation (Details) - shares
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12 Months Ended |
Jan. 01, 2019 |
Jul. 06, 2018 |
Dec. 31, 2018 |
| 2014 Stock Incentive Plan |
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| Fair value of stock-based awards granted to employees, directors, and, in 2018, non-employees, subsequent to the adoption of ASU 2018-07 |
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| Expiration period |
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10 years
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| Total number of shares of common stock authorized to issue |
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19,152,328
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| Number of shares remained available for future issuance |
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47,447
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| 2014 Stock Incentive Plan | Minimum |
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| Fair value of stock-based awards granted to employees, directors, and, in 2018, non-employees, subsequent to the adoption of ASU 2018-07 |
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| Vesting period |
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3 years
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| 2014 Stock Incentive Plan | Maximum |
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| Fair value of stock-based awards granted to employees, directors, and, in 2018, non-employees, subsequent to the adoption of ASU 2018-07 |
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| Vesting period |
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4 years
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| 2014 Stock Incentive Plan | Restricted Common Stock | Minimum |
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| Fair value of stock-based awards granted to employees, directors, and, in 2018, non-employees, subsequent to the adoption of ASU 2018-07 |
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| Vesting period |
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3 years
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| 2014 Stock Incentive Plan | Restricted Common Stock | Maximum |
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| Fair value of stock-based awards granted to employees, directors, and, in 2018, non-employees, subsequent to the adoption of ASU 2018-07 |
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| Vesting period |
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4 years
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| 2018 Equity Incentive Plan |
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| Fair value of stock-based awards granted to employees, directors, and, in 2018, non-employees, subsequent to the adoption of ASU 2018-07 |
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| Total number of shares of common stock authorized to issue |
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5,708,931
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| Number of shares remained available for future issuance |
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2,335,217
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| Annual increase of shares reserved for awards (as a percent) |
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4.00%
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| Increase in number of authorized shares reserved for issuance |
2,377,045
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| 2018 Employee Stock Purchase Plan |
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| Fair value of stock-based awards granted to employees, directors, and, in 2018, non-employees, subsequent to the adoption of ASU 2018-07 |
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| Total number of shares of common stock authorized to issue |
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951,488
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| Number of shares remained available for future issuance |
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951,488
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| Annual increase of shares reserved for awards (as a percent) |
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1.00%
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| Annual increase of shares reserved for awards if less than 1% of the outstanding stock |
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951,488
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| Increase in number of authorized shares reserved for issuance |
792,348
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