Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities and Fair Value - Marketable Securities with Unrealized Losses (Detail)

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Marketable Securities and Fair Value - Marketable Securities with Unrealized Losses (Detail)
$ in Thousands
Mar. 31, 2016
USD ($)
Schedule Of Available For Sale Securities [Line Items]  
Marketable securities, in loss position for less than twelve months, Fair Value $ 11,640
Marketable securities, in loss position for less than twelve months, Unrealized Loss (4)
Corporate Debt Securities  
Schedule Of Available For Sale Securities [Line Items]  
Marketable securities, in loss position for less than twelve months, Fair Value 3,115
Marketable securities, in loss position for less than twelve months, Unrealized Loss (1)
U.S. Government Securities  
Schedule Of Available For Sale Securities [Line Items]  
Marketable securities, in loss position for less than twelve months, Fair Value 8,525
Marketable securities, in loss position for less than twelve months, Unrealized Loss $ (3)