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The Company and Basis of Presentation - Narrative (Details) - USD ($) | Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Related Party Transaction |  |  |
Deferred tax assets, current | $ 0 |  | $ 793,000
Deferred tax asset, noncurrent | $ 1,800,000 |  |
Majority Shareholder |  |  |
Related Party Transaction |  |  |
Percent of outstanding shares held by related party | 57.80% |  |
Accounting Standards Update 2015-07 |  |  |
Related Party Transaction |  |  |
Deferred tax assets, current |  | $ (793,000) |
Deferred tax asset, noncurrent |  | $ 793,000 |

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