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Summary of Cash, Cash Equivalents and Marketable Securities Available-for-sale (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | $ 89,157 | $ 125,085
Unrealized Gains | 13 | 46
Unrealized Losses | (9) | (1)
Estimated Fair Value | 89,161 | 125,130
Cash and Cash Equivalents |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 17,585 | 7,599
Estimated Fair Value | 17,585 | 7,599
Cash and Cash Equivalents | Cash |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 2,068 | 1,542
Estimated Fair Value | 2,068 | 1,542
Cash and Cash Equivalents | Money market funds |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 15,142 | 3,140
Estimated Fair Value | 15,142 | 3,140
Cash and Cash Equivalents | Municipal Securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 375 | 2,202
Estimated Fair Value | 375 | 2,202
Cash and Cash Equivalents | US Government Agencies Debt Securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost |  | 715
Estimated Fair Value |  | 715
Available-for-sale Securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 71,572 | 117,486
Unrealized Gains | 13 | 46
Unrealized Losses | (9) | (1)
Estimated Fair Value | 71,576 | 117,531
Available-for-sale Securities | US Treasury Securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 2,499 | 500
Unrealized Gains | 1 |
Estimated Fair Value | 2,500 | 500
Available-for-sale Securities | US Government Agencies Debt Securities |  |
Cash, cash equivalents and marketable securities [Line Items] |  |
Amortized Cost | 69,073 | 116,986
Unrealized Gains | 12 | 46
Unrealized Losses | (9) | (1)
Estimated Fair Value | $ 69,076 | $ 117,031

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- Definition Amount of accumulated pre-tax unrealized gain before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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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=28360136&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=27724398&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=6871852&loc=d3e26610-111562 + Details
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- Definition 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 + Details
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