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Cash, Cash Equivalents and Investments (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Cash, cash equivalents and investments [Abstract]
Cash	$ 26,250,000	$ 25,299,000
Cash Equivalents, at Carrying Value [Abstract]
Money Market Funds	4,384,000	857,000
Cash Equivalents, at Carrying Value, Total	4,384,000	857,000
Cash and Cash Equivalents, at Carrying Value, Total	30,634,000	26,156,000	23,724,000	16,934,000
Amortized Cost	50,144,000	40,776,000
Gross Unrealized Gain	16,000	7,000
Gross Unrealized (Loss)	(65,000)	(141,000)
Fair Value	50,095,000	40,642,000
Contractual maturities on investments, amortized cost basis [Abstract]
Due within 1 year	10,288,000	5,521,000
Due after 1 through 5 years	9,222,000	9,099,000
Investments, amortized cost	19,510,000	14,620,000
Contractual maturities on investments, fair value basis [Abstract]
Due within 1 year	10,270,000	5,505,000
Due after 1 through 5 years	9,191,000	8,981,000
Investments, fair value	19,461,000	14,486,000
Gross realized losses on available-for-sale securities	0	8,000	(346,000)
Gross realized gains on available-for-sale securities		346,000	346,000
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months	8,323,000	10,098,000
Gross unrealized loss, in loss position less than twelve months	(41,000)	(141,000)
Fair value, in loss position greater than twelve months	1,701,000
Gross unrealized loss, in loss position greater than twelve months	(24,000)
Fair value, total in loss position	10,024,000	10,098,000
Gross unrealized loss, total in loss position	(65,000)	(141,000)
Investment in privately held Companies [Abstract]
Minority investments in unconsolidated privately-held companies	392,000	392,000
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	30,634,000	26,156,000
Recurring [Member]
Assets [Abstract]
Assets, fair value	23,845,000	15,343,000
Liabilities [Abstract]
Liabilities, fair value	0	0
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0	0
Assets, fair value	4,384,000	857,000
Liabilities [Abstract]
Liabilities, fair value	0	0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Assets, fair value	19,461,000	14,486,000
Liabilities [Abstract]
Liabilities, fair value	0	0
Recurring [Member] | Money market fund - cash [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	4,384,000	857,000
Recurring [Member] | Money market fund - cash [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	4,384,000	857,000
Recurring [Member] | Money market fund - cash [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Cash and Cash Equivalents, Fair Value Disclosure	0	0
Recurring [Member] | Certificates of deposit [Member]
Assets [Abstract]
Available-for-sale Securities, Fair Value Disclosure	6,645,000	3,563,000
Recurring [Member] | Certificates of deposit [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets [Abstract]
Available-for-sale Securities, Fair Value Disclosure	0	0
Recurring [Member] | Certificates of deposit [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Available-for-sale Securities, Fair Value Disclosure	6,645,000	3,563,000
Recurring [Member] | US Treasury and agency securities [Member]
Assets [Abstract]
Available-for-sale Securities, Fair Value Disclosure		1,199,000
Recurring [Member] | US Treasury and agency securities [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets [Abstract]
Available-for-sale Securities, Fair Value Disclosure		0
Recurring [Member] | US Treasury and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Available-for-sale Securities, Fair Value Disclosure		1,199,000
Recurring [Member] | Corporate bonds [Member]
Assets [Abstract]
Available-for-sale Securities, Fair Value Disclosure	12,816,000	9,724,000
Recurring [Member] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Available-for-sale Securities, Fair Value Disclosure	12,816,000	9,724,000
Other assets [Member]
Investment in privately held Companies [Abstract]
Investments in privately-held companies	9,400,000	8,300,000
Minority investments in unconsolidated privately-held companies	392,000	392,000
Certificates of deposit [Member]
Cash Equivalents, at Carrying Value [Abstract]
Amortized Cost	6,638,000	3,561,000
Gross Unrealized Gain	9,000	5,000
Gross Unrealized (Loss)	(2,000)	(3,000)
Fair Value	6,645,000	3,563,000
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months	1,877,000	678,000
Gross unrealized loss, in loss position less than twelve months	(1,000)	(3,000)
Fair value, in loss position greater than twelve months	199,000
Gross unrealized loss, in loss position greater than twelve months	(1,000)
Fair value, total in loss position	2,076,000	678,000
Gross unrealized loss, total in loss position	(2,000)	(3,000)
US Treasury and agency securities [Member]
Cash Equivalents, at Carrying Value [Abstract]
Amortized Cost	0	1,200,000
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	0	(1,000)
Fair Value	0	1,199,000
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months		1,199,000
Gross unrealized loss, in loss position less than twelve months		(1,000)
Fair value, total in loss position		1,199,000
Gross unrealized loss, total in loss position		(1,000)
Corporate bonds [Member]
Cash Equivalents, at Carrying Value [Abstract]
Amortized Cost	12,872,000	9,859,000
Gross Unrealized Gain	7,000	2,000
Gross Unrealized (Loss)	(63,000)	(137,000)
Fair Value	12,816,000	9,724,000
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months	6,446,000	8,221,000
Gross unrealized loss, in loss position less than twelve months	(40,000)	(137,000)
Fair value, in loss position greater than twelve months	1,502,000
Gross unrealized loss, in loss position greater than twelve months	(23,000)
Fair value, total in loss position	7,948,000	8,221,000
Gross unrealized loss, total in loss position	(63,000)	(137,000)
Total Investments [Member]
Cash Equivalents, at Carrying Value [Abstract]
Amortized Cost	19,510,000	14,620,000
Gross Unrealized Gain	16,000	7,000
Gross Unrealized (Loss)	(65,000)	(141,000)
Fair Value	$ 19,461,000	$ 14,486,000

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X

- Definition

Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ 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 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.

+ Details

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