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Summary of Intangible Assets Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 2,017 | $ 2,017
Accumulated Amortization | (1,481) | (1,279)
Net Carrying Amount | 536 | 738
Reacquired license - INTERCEPT Asia |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 2,017 | 2,017
Accumulated Amortization | (1,481) | (1,279)
Net Carrying Amount | $ 536 | $ 738

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