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Fair Value Measurement of Assets and Liabilities - Summary of Company's Financial Instruments, Fair Value on a Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Fair Value, Measurements, Recurring [Member] |  |
Cash equivalents |  |
Total cash equivalents | $ 2,255 | $ 3,476
Available-for-sale: |  |
Total short-term marketable securities | 24,432 | 38,064
Total long-term marketable securities | 5,316 | 1,201
Total financial assets | 32,003 | 42,741
Fair Value, Measurements, Recurring [Member] | Government agency securities [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 3,353 | 3,266
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 5,877 | 11,260
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 5,001 | 6,205
Total long-term marketable securities | 2,740 | 1,201
Fair Value, Measurements, Recurring [Member] | Corporate debentures / bonds [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 10,201 | 17,333
Total long-term marketable securities | 2,576 |
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] |  |
Cash equivalents |  |
Total cash equivalents | 47 | 47
Fair Value, Measurements, Recurring [Member] | US Treasury securities [Member] |  |
Cash equivalents |  |
Total cash equivalents | 2,208 | 3,429
Level 1 [Member] |  |
Cash equivalents |  |
Total cash equivalents | 47 | 47
Available-for-sale: |  |
Total short-term marketable securities | 0 | 0
Total long-term marketable securities | 0 | 0
Total financial assets | 47 | 47
Level 1 [Member] | Government agency securities [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 0 | 0
Level 1 [Member] | Municipal bonds [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 0 | 0
Level 1 [Member] | Certificates of deposit [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 0 | 0
Total long-term marketable securities | 0 | 0
Level 1 [Member] | Corporate debentures / bonds [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 0 | 0
Total long-term marketable securities | 0 |
Level 1 [Member] | Money market funds [Member] |  |
Cash equivalents |  |
Total cash equivalents | 47 | 47
Level 1 [Member] | US Treasury securities [Member] |  |
Cash equivalents |  |
Total cash equivalents | 0 | 0
Level 2 [Member] |  |
Cash equivalents |  |
Total cash equivalents | 2,208 | 3,429
Available-for-sale: |  |
Total short-term marketable securities | 24,432 | 38,064
Total long-term marketable securities | 5,316 | 1,201
Total financial assets | 31,956 | 42,694
Level 2 [Member] | Government agency securities [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 3,353 | 3,266
Level 2 [Member] | Municipal bonds [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 5,877 | 11,260
Level 2 [Member] | Certificates of deposit [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 5,001 | 6,205
Total long-term marketable securities | 2,740 | 1,201
Level 2 [Member] | Corporate debentures / bonds [Member] |  |
Available-for-sale: |  |
Total short-term marketable securities | 10,201 | 17,333
Total long-term marketable securities | 2,576 |
Level 2 [Member] | Money market funds [Member] |  |
Cash equivalents |  |
Total cash equivalents | 0 | 0
Level 2 [Member] | US Treasury securities [Member] |  |
Cash equivalents |  |
Total cash equivalents | $ 2,208 | $ 3,429

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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=25499696&loc=d3e19207-110258 + Details
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- Definition Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + 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 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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