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Significant Accounting Policies and Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 29, 2019 | Sep. 29, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Operating lease right-of-use assets, net | $ 32,008 | $ 32,008 |  |  |  |  |
Operating lease liability | 34,298 | 34,298 |  |  |  |  |
Total property and equipment, gross | 41,903 | 41,903 |  |  |  |  | $ 60,443
Property and equipment, net | 24,216 | 24,216 |  |  |  |  | 49,428
Accumulated deficit | (151,134) | (151,134) |  |  |  |  | (45,849)
Build-to-suit lease |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Property and equipment, net | 0 | 0 |  |  |  |  | $ 21,610
Accumulated deficit | $ 281 | $ 281 |  |  |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Operating lease right-of-use assets, net |  |  |  | $ 7,200 | $ 14,300 | $ 14,400 |
Operating lease liability |  |  |  | $ 7,200 | $ 14,300 | 14,400 |
Accounting Standards Update 2016-02 | Build-to-suit lease |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Property and equipment, net |  |  |  |  |  | (21,610) |
Finance lease liability |  |  |  |  |  | (21,900) |
Accumulated deficit |  |  |  |  |  | $ 281 |
RSUs | Tranche One |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock awards, annual vesting installments (as a percentage) |  | 33.33% |  |  |  |  |
RSUs | Tranche Two |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock awards, annual vesting installments (as a percentage) |  | 33.33% |  |  |  |  |
RSUs | Tranche Three |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock awards, annual vesting installments (as a percentage) |  | 33.33% |  |  |  |  |
RSUs | Executive Officer |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock awards, annual vesting installments (as a percentage) | 50.00% |  |  |  |  |  |
PSUs | Minimum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Number of shares that can be earned of targeted award (as a percentage) |  | 50.00% |  |  |  |  |
PSUs | Maximum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Number of shares that can be earned of targeted award (as a percentage) |  | 150.00% |  |  |  |  |
PSUs | Tranche One |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock awards, annual vesting installments (as a percentage) |  | 33.33% |  |  |  |  |
PSUs | Tranche Two |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock awards, annual vesting installments (as a percentage) |  | 33.33% |  |  |  |  |
PSUs | Tranche Three |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock awards, annual vesting installments (as a percentage) |  | 33.33% |  |  |  |  |
PSUs | Executive Officer |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock awards, annual vesting installments (as a percentage) | 25.00% |  |  |  |  |  |
MPSUs |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |
Positive movement of benchmark (multiplier) | 3.3 | 3.3 |  |  |  |  |
Negative movement of benchmark (multiplier) | 2.5 | 2.5 |  |  |  |  |
Positive movement of benchmark (as a percentage) | 3.30% | 3.30% |  |  |  |  |
Negative movement of benchmark (as a percentage) | 2.50% | 2.50% |  |  |  |  |
Movement of benchmark, increment (as a percentage) | 1.00% | 1.00% |  |  |  |  |
Threshold (as a percentage) | 30.00% | 30.00% |  |  |  |  |
MPSUs | Maximum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Threshold (as a percentage) | 200.00% | 200.00% |  |  |  |  |
MPSUs | Executive Officer |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stock awards, annual vesting installments (as a percentage) | 25.00% |  |  |  |  |  |
2018 Plan | Minimum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |
2018 Plan | Maximum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |
2018 Plan | Stock Options |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |
2018 Plan | Stock Options | Tranche One |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |
2018 Plan | RSUs | Minimum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |  |
2018 Plan | RSUs | Maximum |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Vesting period |  | 4 years |  |  |  |  |
2018 Stock Repurchase Program | ESPP |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Maximum percentage of compensation contributed by employees |  |  | 15.00% |  |  |  |
ESPP purchase price of common stock, percent of market price |  |  | 85.00% |  |  |  |
Offering period (in years) |  | 6 months |  |  |  |  |

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