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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Fair value of financial and nonfinancial obligations.

+ References

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- Definition

Amount after tax of other than temporary impairment (OTTI) on investment in available-for-sale debt security, recognized in other comprehensive loss, attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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Fair Value Measurements (Detail) - USD ($)	3 Months Ended		6 Months Ended
Fair Value Measurements (Detail) - USD ($)	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Assets
Marketable securities	$ 97,611,000		$ 97,611,000
Other-than-temporary impairments	0	$ 0	0	$ 0
Fair value measurements, recurring [Member]
Assets
Marketable securities	97,611,000		97,611,000		$ 102,839,000
Total	97,782,000		97,782,000		103,085,000
Financial liabilities measured at fair value on a recurring basis	0		0		0
Fair value measurements, recurring [Member] \| Commercial paper [Member]
Assets
Marketable securities	8,186,000		8,186,000		7,485,000
Fair value measurements, recurring [Member] \| Corporate notes and bonds [Member]
Assets
Marketable securities	46,984,000		46,984,000		48,859,000
Fair value measurements, recurring [Member] \| Government obligations [Member]
Assets
Marketable securities	13,026,000		13,026,000		13,991,000
Fair value measurements, recurring [Member] \| U.S. agency obligations [Member]
Assets
Marketable securities	29,415,000		29,415,000		32,504,000
Fair value measurements, recurring [Member] \| Money market mutual funds [Member]
Assets
Cash equivalents	171,000		171,000		246,000
Fair value measurements, recurring [Member] \| Level 1 [Member]
Assets
Marketable securities	0		0		0
Total	171,000		171,000		246,000
Fair value measurements, recurring [Member] \| Level 1 [Member] \| Commercial paper [Member]
Assets
Marketable securities	0		0		0
Fair value measurements, recurring [Member] \| Level 1 [Member] \| Corporate notes and bonds [Member]
Assets
Marketable securities	0		0		0
Fair value measurements, recurring [Member] \| Level 1 [Member] \| Government obligations [Member]
Assets
Marketable securities	0		0		0
Fair value measurements, recurring [Member] \| Level 1 [Member] \| U.S. agency obligations [Member]
Assets
Marketable securities	0		0		0
Fair value measurements, recurring [Member] \| Level 1 [Member] \| Money market mutual funds [Member]
Assets
Cash equivalents	171,000		171,000		246,000
Fair value measurements, recurring [Member] \| Level 2 [Member]
Assets
Marketable securities	97,611,000		97,611,000		102,839,000
Total	97,611,000		97,611,000		102,839,000
Fair value measurements, recurring [Member] \| Level 2 [Member] \| Commercial paper [Member]
Assets
Marketable securities	8,186,000		8,186,000		7,485,000
Fair value measurements, recurring [Member] \| Level 2 [Member] \| Corporate notes and bonds [Member]
Assets
Marketable securities	46,984,000		46,984,000		48,859,000
Fair value measurements, recurring [Member] \| Level 2 [Member] \| Government obligations [Member]
Assets
Marketable securities	13,026,000		13,026,000		13,991,000
Fair value measurements, recurring [Member] \| Level 2 [Member] \| U.S. agency obligations [Member]
Assets
Marketable securities	29,415,000		29,415,000		32,504,000
Fair value measurements, recurring [Member] \| Level 2 [Member] \| Money market mutual funds [Member]
Assets
Cash equivalents	0		0		0
Fair value measurements, recurring [Member] \| Level 3 [Member]
Assets
Marketable securities	0		0		0
Total	0		0		0
Fair value measurements, recurring [Member] \| Level 3 [Member] \| Commercial paper [Member]
Assets
Marketable securities	0		0		0
Fair value measurements, recurring [Member] \| Level 3 [Member] \| Corporate notes and bonds [Member]
Assets
Marketable securities	0		0		0
Fair value measurements, recurring [Member] \| Level 3 [Member] \| Government obligations [Member]
Assets
Marketable securities	0		0		0
Fair value measurements, recurring [Member] \| Level 3 [Member] \| U.S. agency obligations [Member]
Assets
Marketable securities	0		0		0
Fair value measurements, recurring [Member] \| Level 3 [Member] \| Money market mutual funds [Member]
Assets
Cash equivalents	$ 0		$ 0		$ 0