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Investments and Fair Value Measurements (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Cash, cash equivalents and investments [Abstract]
Amortized Cost	$ 47,096,000		$ 47,096,000		$ 40,776,000
Gross Unrealized Gain	14,000		14,000		7,000
Gross Unrealized (Loss)	(42,000)		(42,000)		(141,000)
Fair Value	47,068,000		47,068,000		40,642,000
Contractual maturities on investments, amortized cost basis
Due within 1 year	11,494,000		11,494,000		5,521,000
Due after 1 through 5 years	4,321,000		4,321,000		9,099,000
Investments, amortized cost	15,815,000		15,815,000		14,620,000
Contractual maturities on investments, fair value basis
Due within 1 year	11,465,000		11,465,000		5,505,000
Due after 1 through 5 years	4,322,000		4,322,000		8,981,000
Investments, fair value	15,787,000		15,787,000		14,486,000
Gross realized loss on available-for-sale securities	0	3,000	0	8,000
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months	3,752,000		3,752,000
Fair value, in loss position greater than twelve months	5,074,000		5,074,000
Fair value, total in loss position	8,826,000		8,826,000
Gross unrealized loss, in loss position less than twelve months	(7,000)		(7,000)
Gross unrealized loss, in loss position greater than twelve months	(35,000)		(35,000)
Gross unrealized loss, total in loss position	(42,000)		(42,000)
Investment in privately held Companies [Abstract]
Minority investments in unconsolidated privately-held companies	392,000		392,000		392,000
Recurring [Member]
Assets:
Assets, fair value	15,793,000		15,793,000
Liabilities:
Liabilities, fair value	0		0
Recurring [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets:
Assets, fair value	6,000		6,000
Liabilities:
Liabilities, fair value	0		0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Assets, fair value	15,787,000		15,787,000
Liabilities:
Liabilities, fair value	0		0
Recurring [Member] | Money market fund [Member]
Assets:
Assets, fair value	6,000		6,000
Recurring [Member] | Money market fund [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets:
Assets, fair value	6,000		6,000
Recurring [Member] | Money market fund [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Assets, fair value	0		0
Recurring [Member] | Certificates of deposit [Member]
Assets:
Assets, fair value	6,397,000		6,397,000
Recurring [Member] | Certificates of deposit [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets:
Assets, fair value	0		0
Recurring [Member] | Certificates of deposit [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Assets, fair value	6,397,000		6,397,000
Recurring [Member] | US Treasury and agency securities [Member]
Assets:
Assets, fair value	1,200,000		1,200,000
Recurring [Member] | US Treasury and agency securities [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets:
Assets, fair value	0		0
Recurring [Member] | US Treasury and agency securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Assets, fair value	1,200,000		1,200,000
Recurring [Member] | Corporate bonds [Member]
Assets:
Assets, fair value	8,190,000		8,190,000
Recurring [Member] | Corporate bonds [Member] | Quoted Prices in Active Markets of Identical Assets (Level 1) [Member]
Assets:
Assets, fair value	0		0
Recurring [Member] | Corporate bonds [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Assets, fair value	8,190,000		8,190,000
Other assets [Member]
Investment in privately held Companies [Abstract]
Investments in privately-held companies	8,800,000		8,800,000		8,300,000
Money market fund [Member]
Cash, cash equivalents and investments [Abstract]
Amortized Cost	6,000		6,000		857,000
Gross Unrealized Gain	0		0		0
Gross Unrealized (Loss)	0		0		0
Fair Value	6,000		6,000		857,000
Certificates of deposit [Member]
Cash, cash equivalents and investments [Abstract]
Amortized Cost	6,399,000		6,399,000		3,561,000
Gross Unrealized Gain	5,000		5,000		5,000
Gross Unrealized (Loss)	(7,000)		(7,000)		(3,000)
Fair Value	6,397,000		6,397,000		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	3,752,000		3,752,000
Fair value, in loss position greater than twelve months	0		0
Fair value, total in loss position	3,752,000		3,752,000
Gross unrealized loss, in loss position less than twelve months	(7,000)		(7,000)
Gross unrealized loss, in loss position greater than twelve months	0		0
Gross unrealized loss, total in loss position	(7,000)		(7,000)
US Treasury and agency securities [Member]
Cash, cash equivalents and investments [Abstract]
Amortized Cost	1,200,000		1,200,000		1,200,000
Gross Unrealized Gain	0		0		0
Gross Unrealized (Loss)	0		0		(1,000)
Fair Value	1,200,000		1,200,000		1,199,000
Corporate bonds [Member]
Cash, cash equivalents and investments [Abstract]
Amortized Cost	8,216,000		8,216,000		9,859,000
Gross Unrealized Gain	9,000		9,000		2,000
Gross Unrealized (Loss)	(35,000)		(35,000)		(137,000)
Fair Value	8,190,000		8,190,000		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	0		0
Fair value, in loss position greater than twelve months	5,074,000		5,074,000
Fair value, total in loss position	5,074,000		5,074,000
Gross unrealized loss, in loss position less than twelve months	0		0
Gross unrealized loss, in loss position greater than twelve months	(35,000)		(35,000)
Gross unrealized loss, total in loss position	(35,000)		(35,000)
Investments [Member]
Cash, cash equivalents and investments [Abstract]
Amortized Cost	15,815,000		15,815,000		14,620,000
Gross Unrealized Gain	14,000		14,000		7,000
Gross Unrealized (Loss)	(42,000)		(42,000)		(141,000)
Fair Value	15,787,000		15,787,000		14,486,000
Cash [Member]
Cash, cash equivalents and investments [Abstract]
Amortized Cost	31,275,000		31,275,000		25,299,000
Gross Unrealized Gain	0		0		0
Gross Unrealized (Loss)	0		0		0
Fair Value	31,275,000		31,275,000		25,299,000
Cash equivalents [Member]
Cash, cash equivalents and investments [Abstract]
Amortized Cost	6,000		6,000		857,000
Gross Unrealized Gain	0		0		0
Gross Unrealized (Loss)	0		0		0
Fair Value	6,000		6,000		857,000
Total cash and cash equivalents [Member]
Cash, cash equivalents and investments [Abstract]
Amortized Cost	31,281,000		31,281,000		26,156,000
Gross Unrealized Gain	0		0		0
Gross Unrealized (Loss)	0		0		0
Fair Value	$ 31,281,000		$ 31,281,000		$ 26,156,000

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