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Cash, Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Cash, Cash Equivalents and Marketable Securities | The following is a summary of cash, cash equivalents and marketable securities as of December 31, 2012, and 2011 (in thousands):
|  | Amortized Cost |  |  | Unrealized Gains |  |  | Unrealized Losses |  |  | Estimated Fair Value |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 1,542 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,542 |
Money market funds |  |  | 3,140 |  |  |  | — |  |  |  | — |  |  |  | 3,140 |
U.S. government agency securities |  |  | 715 |  |  |  | — |  |  |  | — |  |  |  | 715 |
Municipal securities |  |  | 2,202 |  |  |  | — |  |  |  | — |  |  |  | 2,202 |
Total cash and cash equivalents |  |  | 7,599 |  |  |  | — |  |  |  | — |  |  |  | 7,599 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities |  |  | 116,986 |  |  |  | 46 |  |  |  | (1 | ) |  |  | 117,031 |
U.S. treasury securities |  |  | 500 |  |  |  | — |  |  |  | — |  |  |  | 500 |
Total marketable securities available-for-sale |  |  | 117,486 |  |  |  | 46 |  |  |  | (1 | ) |  |  | 117,531 |
Total cash, cash equivalents and marketable securities |  | $ | 125,085 |  |  | $ | 46 |  |  | $ | (1 | ) |  | $ | 125,130 |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 2,290 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,290 |
Money market funds |  |  | 17,171 |  |  |  | — |  |  |  | — |  |  |  | 17,171 |
U.S. government agency securities |  |  | 2,013 |  |  |  | — |  |  |  | — |  |  |  | 2,013 |
U.S. treasury securities |  |  | 7,425 |  |  |  | — |  |  |  | — |  |  |  | 7,425 |
Corporate debt securities, secured by the U.S. government |  |  | 3,044 |  |  |  | — |  |  |  | (2 | ) |  |  | 3,042 |
Total cash and cash equivalents |  |  | 31,943 |  |  |  | — |  |  |  | (2 | ) |  |  | 31,941 |
Marketable securities available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. government agency securities |  |  | 26,488 |  |  |  | — |  |  |  | (5 | ) |  |  | 26,483 |
Corporate debt securities, secured by the U.S. government |  |  | 55,533 |  |  |  | 9 |  |  |  | (5 | ) |  |  | 55,537 |
Total marketable securities available-for-sale |  |  | 82,021 |  |  |  | 9 |  |  |  | (10 | ) |  |  | 82,020 |
Total cash, cash equivalents and marketable securities |  | $ | 113,964 |  |  | $ | 9 |  |  | $ | (12 | ) |  | $ | 113,961 |
Maturities of Marketable Securities Available-for-Sale | The maturities of our marketable securities available-for-sale are as follows (in thousands)
|  | December 31, 2012 |
|  | Amortized Cost |  |  | Estimated Fair Value |
Mature in one year or less |  | $ | 79,743 |  |  | $ | 79,772 |
Mature after one year through two years |  |  | 37,743 |  |  |  | 37,759 |
|  | $ | 117,486 |  |  | $ | 117,531 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -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 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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