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Available for Sale Marketable Securities in Unrealized Position (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | $ 20,170 | $ 25,595
Less than 12 Months, Unrealized Loss | (46) | (31)
12 Months or Longer, Fair Value | 5,528 |
12 Months or Longer, Unrealized Loss | (3) |
Total, Fair Value | 25,698 | 25,595
Total, Unrealized Loss | (49) | (31)
Corporate debt securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value | 20,170 | 22,169
Less than 12 Months, Unrealized Loss | (46) | (30)
12 Months or Longer, Fair Value | 5,528 |
12 Months or Longer, Unrealized Loss | (3) |
Total, Fair Value | 25,698 | 22,169
Total, Unrealized Loss | $ (49) | (30)
United States government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 Months, Fair Value |  | 3,426
Less than 12 Months, Unrealized Loss |  | (1)
12 Months or Longer, Fair Value |  | 0
12 Months or Longer, Unrealized Loss |  | 0
Total, Fair Value |  | 3,426
Total, Unrealized Loss |  | $ (1)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 + Details
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