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Fair Value Measurement of Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Cash equivalents
Total cash equivalents	$ 778	$ 3,476
Available-for-sale:
Total short-term marketable securities	29,995	38,064
Total long-term marketable securities	9,862	1,201
Total financial assets	40,635	42,741
Fair Value, Measurements, Recurring [Member] | Government agency securities [Member]
Available-for-sale:
Total short-term marketable securities	4,272	3,266
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
Available-for-sale:
Total short-term marketable securities	11,387	11,260
Total long-term marketable securities	1,670
Fair Value, Measurements, Recurring [Member] | Certificates of deposit [Member]
Available-for-sale:
Total short-term marketable securities	4,999	6,205
Total long-term marketable securities	1,920	1,201
Fair Value, Measurements, Recurring [Member] | Corporate debentures / bonds [Member]
Available-for-sale:
Total short-term marketable securities	9,337	17,333
Total long-term marketable securities	6,272
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	731	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
Total long-term marketable securities	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	731	3,429
Available-for-sale:
Total short-term marketable securities	29,995	38,064
Total long-term marketable securities	9,862	1,201
Total financial assets	40,588	42,694
Level 2 [Member] | Government agency securities [Member]
Available-for-sale:
Total short-term marketable securities	4,272	3,266
Level 2 [Member] | Municipal bonds [Member]
Available-for-sale:
Total short-term marketable securities	11,387	11,260
Total long-term marketable securities	1,670
Level 2 [Member] | Certificates of deposit [Member]
Available-for-sale:
Total short-term marketable securities	4,999	6,205
Total long-term marketable securities	1,920	1,201
Level 2 [Member] | Corporate debentures / bonds [Member]
Available-for-sale:
Total short-term marketable securities	9,337	17,333
Total long-term marketable securities	6,272
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	$ 731	$ 3,429

X

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ 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=7578670&loc=d3e19207-110258

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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Namespace Prefix:	us-gaap_
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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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 1

-Article 5



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



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 8, 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: 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

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X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant