XML 30 R29.htm IDEA: XBRL DOCUMENT

Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Level 1 [Member]
Assets
Total cash equivalents and investments	$ 20,736	$ 101,839
Level 1 [Member] \| Auction Rate Securities [Member]
Assets
Total cash equivalents and investments		1,790
Level 1 [Member] \| Money market funds [Member]
Assets
Total cash equivalents and investments	20,736	100,049
Level 1 [Member] \| Government-backed security [Member]
Assets
Total cash equivalents and investments
Level 1 [Member] \| Asset-backed securities [Member]
Assets
Total cash equivalents and investments
Level 1 [Member] \| Corporate Debt Securities [Member]
Assets
Total cash equivalents and investments
Level 2 [Member]
Assets
Total cash equivalents and investments	165,806	26,978
Level 2 [Member] \| Auction Rate Securities [Member]
Assets
Total cash equivalents and investments
Level 2 [Member] \| Money market funds [Member]
Assets
Total cash equivalents and investments
Level 2 [Member] \| Government-backed security [Member]
Assets
Total cash equivalents and investments	10,000
Level 2 [Member] \| Asset-backed securities [Member]
Assets
Total cash equivalents and investments	50,300
Level 2 [Member] \| Corporate Debt Securities [Member]
Assets
Total cash equivalents and investments	105,506	26,978
Level 3 [Member]
Assets
Total cash equivalents and investments
Level 3 [Member] \| Auction Rate Securities [Member]
Assets
Total cash equivalents and investments
Level 3 [Member] \| Money market funds [Member]
Assets
Total cash equivalents and investments
Level 3 [Member] \| Government-backed security [Member]
Assets
Total cash equivalents and investments
Level 3 [Member] \| Asset-backed securities [Member]
Assets
Total cash equivalents and investments
Level 3 [Member] \| Corporate Debt Securities [Member]
Assets
Total cash equivalents and investments