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Balance Sheet Components (Goodwill Impairment Narrative) (Details) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 07, 2019 USD ($) | Feb. 05, 2019 $ / shares | Sep. 29, 2019 USD ($) | Sep. 29, 2019 segment | Dec. 31, 2018 USD ($)
Goodwill [Line Items] |  |  |  |  |
Average cost per share (in usd per share) | $ / shares |  | $ 3.71 |  |  |
Decrease in average cost per share (as a percentage) |  | 223.30% |  |  |
Number of operating segments | segment |  |  |  | 1 |
Number of reportable segments | segment |  |  |  | 1 |
Fair value in excess of carrying amount (as a percentage) | 29.80% |  |  |  |
Decrease in stock price, estimated impairment loss | $ | $ 15,600,000 |  |  |  |
Goodwill impairment | $ |  |  | $ 0 |  | $ 0
MPAP |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Market participant acquisition premium | 0.25 |  |  |  |
Fair value in excess of carrying amount (as a percentage) | 27.20% |  |  |  |
MPAP - Adjustment |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |
Market participant acquisition premium | 2.50 |  |  |  |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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