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Fair-Value Measurements - Narrative (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value Disclosures [Abstract]    
Cash excluded from fair value hierarchy disclosure $ 4,600,000 $ 1,400,000
Unrealized gain (loss) on investments $ 0 $ 0