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Business Segments, Concentration of Credit Risk and Significant Customers - Segments/Concentration (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) segment item | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) segment item | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Business Segments |  |  |  |  |  |  |
Number of business segments | segment |  |  | 1 |  | 1 |  |
Number of measurements of profitability | item |  |  | 1 |  | 1 |  |
Total net revenue | $ 2,453 | $ 1,573 | $ 5,049 | $ 4,657 | $ 6,024 | $ 4,390 | $ 5,380
North America |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |
Total net revenue | 1,915 | 937 | 3,698 | 2,905 | 3,816 | 2,222 | 1,485
Japan |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |
Total net revenue | 384 | 398 | 755 | 1,103 | 1,303 | 667 | 1,961
Taiwan |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |
Total net revenue | 123 | 209 | 463 | 581 | 804 | 1,396 | 1,894
Rest of world |  |  |  |  |  |  |
Business Segments |  |  |  |  |  |  |
Total net revenue | $ 31 | $ 29 | $ 133 | $ 68 | $ 101 | $ 105 | $ 40

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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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