2.4.0.8080200 - Disclosure - Cash and Cash Equivalents and Marketable Securities (Tables)truefalsefalse1false falsefalsec20130101to20130630http://www.sec.gov/CIK0001162461duration2013-01-01T00:00:002013-06-30T00:00:001true 1us-gaap_InvestmentsDebtAndEquitySecuritiesAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Cash and Cash Equivalents and Marketable Securities [Abstract]2false 2us-gaap_UnrealizedGainLossOnInvestmentsTableTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00<div style="font-family: 'Times New Roman', Times, serif; font-size: 10pt;"><div style="text-align: left; font-family: ''Times New Roman'', Times, serif; font-size: 10pt;">The following tables summarize unrealized gains and losses related to our marketable investments, designated as available-for-sale (in thousands):</div><div><br /></div><table cellpadding="0" cellspacing="0" style="width: 100%; font-family: 'Times New Roman', Times, serif; font-size: 10pt;"><tr><td valign="bottom" style="border-bottom: #000000 1px solid; padding-bottom: 2px; vertical-align: bottom;"><div style="text-align: left; text-indent: -16.2pt; font-family: ''Times New Roman'', Times, serif; margin-left: 16.2pt; font-size: 10pt; font-weight: bold;">June 30, 2013</div></td><td valign="bottom" style="padding-bottom: 2px; vertical-align: bottom;">&#160;</td><td colspan="2" valign="bottom" style="border-bottom: #000000 2px solid; vertical-align: bottom;"><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Amortized </div><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Cost</div></td><td nowrap="nowrap" valign="bottom" style="text-align: left; padding-bottom: 2px; vertical-align: bottom;">&#160;</td><td valign="bottom" style="padding-bottom: 2px; vertical-align: bottom;">&#160;</td><td colspan="2" valign="bottom" style="border-bottom: #000000 2px solid; vertical-align: bottom;"><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Gross </div><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Unrealized </div><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Gains</div></td><td nowrap="nowrap" valign="bottom" style="text-align: left; padding-bottom: 2px; vertical-align: bottom;">&#160;</td><td valign="bottom" style="padding-bottom: 2px; vertical-align: bottom;">&#160;</td><td colspan="2" valign="bottom" style="border-bottom: #000000 2px solid; vertical-align: bottom;"><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Gross </div><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Unrealized </div><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Losses</div></td><td nowrap="nowrap" valign="bottom" style="text-align: left; padding-bottom: 2px; vertical-align: bottom;">&#160;</td><td valign="bottom" style="padding-bottom: 2px; vertical-align: bottom;">&#160;</td><td colspan="2" valign="bottom" style="border-bottom: #000000 2px solid; vertical-align: bottom;"><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Fair Market </div><div style="text-align: center; font-family: ''Times New Roman'', Times, serif; font-size: 10pt; font-weight: bold;">Value</div></td><td nowrap="nowrap" valign="bottom" style="text-align: left; padding-bottom: 2px; vertical-align: bottom;">&#160;</td></tr><tr><td valign="bottom" style="vertical-align: bottom;"><div style="text-align: left; text-indent: -16.2pt; font-family: ''Times New Roman'', Times, serif; margin-left: 16.2pt; font-size: 10pt;">Cash and cash equivalents:</div></td><td valign="bottom" style="vertical-align: bottom;">&#160;</td><td colspan="2" valign="bottom" style="vertical-align: bottom;"><div></div></td><td nowrap="nowrap" valign="bottom" style="text-align: left; vertical-align: bottom;">&#160;</td><td valign="bottom" style="vertical-align: bottom;">&#160;</td><td colspan="2" valign="bottom" style="vertical-align: bottom;"><div></div></td><td nowrap="nowrap" valign="bottom" style="text-align: left; vertical-align: bottom;">&#160;</td><td valign="bottom" style="vertical-align: bottom;">&#160;</td><td colspan="2" valign="bottom" style="vertical-align: bottom;"><div></div></td><td nowrap="nowrap" valign="bottom" style="text-align: left; vertical-align: bottom;">&#160;</td><td valign="bottom" style="vertical-align: bottom;">&#160;</td><td colspan="2" valign="bottom" style="vertical-align: bottom;"><div></div></td><td nowrap="nowrap" valign="bottom" style="text-align: left; vertical-align: bottom;">&#160;</td></tr><tr><td valign="bottom" style="background-color: #cceeff; width: 52%; vertical-align: bottom;"><div style="text-align: left; text-indent: -16.2pt; font-family: ''Times New Roman'', Times, serif; margin-left: 25.2pt; font-size: 10pt;">Cash</div></td><td valign="bottom" style="background-color: #cceeff; 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