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Total Assets by Geographic Area (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Asset | $ 146,237 | $ 128,293
United States |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Asset | 91,881 | 83,785
Sweden |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Asset | 54,313 | $ 44,508
Singapore |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Asset | $ 43 |

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