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Organization and Summary of Significant Accounting Policies - Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 29, 2019 | Sep. 29, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 30, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 29, 2019 | Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2019 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ 712.0 |  |  |  | $ 724.5 |  |  |  | $ 712.0 | $ 724.5 |  |  |
Revenue | 185.1 | $ 184.1 | $ 187.9 | $ 160.4 | 164.4 | $ 159.4 | $ 151.2 | $ 143.0 | 717.5 | 618.0 | $ 603.3 |  |
Remaining performance obligation | 601.2 |  |  |  |  |  |  |  | 601.2 |  |  |  |
Provision for loss on contracts | 3.1 |  |  |  | 5.1 |  |  |  | 3.1 | 5.1 |  |  |
Contract assets, Net change |  |  |  |  |  |  |  |  | 6.6 |  |  |  |
Contract liabilities, Net change |  |  |  |  |  |  |  |  | (2.7) |  |  |  |
Revenue recognized |  |  |  |  |  |  |  |  | 30.5 | 35.5 |  |  |
Contract assets | 179.4 |  |  |  |  |  |  |  | 179.4 |  |  | $ 172.8 |
Unbilled |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | 4.7 |  |  |  | $ 3.8 |  |  |  | 4.7 | $ 3.8 |  |  |
Unbilled | T for C |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contract assets | 11.5 |  |  |  |  |  |  |  | 11.5 |  |  |  |
Unbilled | International Customer |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Contract assets | $ 10.0 |  |  |  |  |  |  |  | 10.0 |  |  |  |
Effect of Change Higher/(Lower) |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 30.0 |  |  |  |
Cost of revenue |  |  |  |  |  |  |  |  | $ 21.9 |  |  |  |
ASC 606 Adjustment | ASC 606 |  |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.2

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