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Marketable Securities - Schedule of Investments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 128,212	$ 73,262
Gross Unrealized Gains	12	26
Gross Unrealized (Losses)
Estimated Fair Value	128,224	73,288
Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,934	18,836
Gross Unrealized Gains
Gross Unrealized (Losses)
Estimated Fair Value	6,934	18,836
Money market funds [Member] | Cash equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,934	15,839
Gross Unrealized Gains
Gross Unrealized (Losses)
Estimated Fair Value	6,934	15,839
U.S. government sponsored entity debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		2,997
Gross Unrealized Gains
Gross Unrealized (Losses)
Estimated Fair Value		2,997
U.S. government sponsored entity debt securities [Member] | Available-for-sale securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	121,278	54,426
Gross Unrealized Gains	12	26
Gross Unrealized (Losses)
Estimated Fair Value	$ 121,290	$ 54,452

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- Definition

Available for sale securities gross unrealized gains accumulated in investments.

+ References

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Available for sale securities gross unrealized loss accumulated in investments.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.4)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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