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Investments and Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2013
Investments and Fair Value Measurements [Abstract] |
Cash, cash equivalents and investments | Our cash, cash equivalents and investments are classified as follows (in thousands):
|  | March 31, 2013 |  |  | December 31, 2012 |
|  |  |  |  | Gross |  |  | Gross |  |  |  |  |  |  |  |  | Gross |  |  | Gross |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |  |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | (Loss) |  |  | Value |  |  | Cost |  |  | Gain |  |  | (Loss) |  |  | Value |
Classified as: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 25,789 |  |  | $ | — |  |  | $ | — |  |  | $ | 25,789 |  |  | $ | 26,250 |  |  | $ | — |  |  | $ | — |  |  | $ | 26,250 |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market fund |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | 3 |  |  |  | 4,384 |  |  |  | — |  |  |  | — |  |  |  | 4,384 |
Total cash equivalents |  |  | 3 |  |  |  | — |  |  |  | — |  |  |  | 3 |  |  |  | 4,384 |  |  |  | — |  |  |  | — |  |  |  | 4,384 |
Total cash and cash equivalents |  |  | 25,792 |  |  |  | — |  |  |  | — |  |  |  | 25,792 |  |  |  | 30,634 |  |  |  | — |  |  |  | — |  |  |  | 30,634 |
Investments (available for sale): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  |  | 6,998 |  |  |  | 8 |  |  |  | (7 | ) |  |  | 6,999 |  |  |  | 6,638 |  |  |  | 9 |  |  |  | (2 | ) |  |  | 6,645 |
Corporate bonds |  |  | 16,646 |  |  |  | 4 |  |  |  | (71 | ) |  |  | 16,579 |  |  |  | 12,872 |  |  |  | 7 |  |  |  | (63 | ) |  |  | 12,816 |
Total investments |  |  | 23,644 |  |  |  | 12 |  |  |  | (78 | ) |  |  | 23,578 |  |  |  | 19,510 |  |  |  | 16 |  |  |  | (65 | ) |  |  | 19,461 |
Total cash, cash equivalents and investments |  | $ | 49,436 |  |  | $ | 12 |  |  | $ | (78 | ) |  | $ | 49,370 |  |  | $ | 50,144 |  |  | $ | 16 |  |  | $ | (65 | ) |  | $ | 50,095 |
Contractual maturities on investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Due within 1 year |  | $ | 6,536 |  |  |  |  |  |  |  |  |  |  | $ | 6,540 |  |  | $ | 10,288 |  |  |  |  |  |  |  |  |  |  | $ | 10,270 |
Due after 1 through 5 years |  |  | 17,108 |  |  |  |  |  |  |  |  |  |  |  | 17,038 |  |  |  | 9,222 |  |  |  |  |  |  |  |  |  |  |  | 9,191 |
|  | $ | 23,644 |  |  |  |  |  |  |  |  |  |  | $ | 23,578 |  |  | $ | 19,510 |  |  |  |  |  |  |  |  |  |  | $ | 19,461 |
Fair value and gross unrealized losses related to available-for-sale securities | The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of March 31, 2013 (in thousands):
|  | In Loss Position < 12 Months |  |  | In Loss Position > 12 Months |  |  | Total In Loss Position |
|  | Fair Value |  |  | Gross Unrealized (Loss) |  |  | Fair Value |  |  | Gross Unrealized (Loss) |  |  | Fair Value |  |  | Gross Unrealized (Loss) |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 2,953 |  |  | $ | (7 | ) |  | $ | — |  |  | $ | — |  |  | $ | 2,953 |  |  | $ | (7 | )
Corporate bonds |  |  | 12,788 |  |  |  | (71 | ) |  |  | — |  |  |  | — |  |  |  | 12,788 |  |  |  | (71 | )
Total in loss position |  | $ | 15,741 |  |  | $ | (78 | ) |  | $ | — |  |  | $ | — |  |  | $ | 15,741 |  |  | $ | (78 | )
The following table summarizes the fair value and gross unrealized losses related to available-for-sale securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2012 (in thousands):
|  | In Loss Position < 12 Months |  |  | In Loss Position > 12 Months |  |  | Total In Loss Position |
|  | Fair Value |  |  | Gross Unrealized (Loss) |  |  | Fair Value |  |  | Gross Unrealized (Loss) |  |  | Fair Value |  |  | Gross Unrealized (Loss) |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 1,877 |  |  | $ | (1 | ) |  | $ | 199 |  |  | $ | (1 | ) |  | $ | 2,076 |  |  | $ | (2 | )
Corporate bonds |  |  | 6,446 |  |  |  | (40 | ) |  |  | 1,502 |  |  |  | (23 | ) |  |  | 7,948 |  |  |  | (63 | )
Total in loss position |  | $ | 8,323 |  |  | $ | (41 | ) |  | $ | 1,701 |  |  | $ | (24 | ) |  | $ | 10,024 |  |  | $ | (65 | )
Summary of financial assets and liabilities measured at fair value on a recurring basis | The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2013 (in thousands):
|  | Balance as of March 31, 2013 |  | Quoted Prices in Active Markets of Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |
Assets: |  |  |  |  |  |  |
Cash equivalents and investments: |  |  |  |  |  |  |
Money market fund |  | $ | 3 |  | $ | 3 |  | $ | — |
Certificates of deposit |  |  | 6,999 |  |  | — |  |  | 6,999 |
Corporate bonds |  |  | 16,579 |  |  | — |  |  | 16,579 |
Total |  | $ | 23,581 |  | $ | 3 |  | $ | 23,578 |
Liabilities |  | $ | — |  | $ | — |  | $ | — |
The following table summarizes our financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2012 (in thousands):
|  | Balance as of December 31, 2012 |  | Quoted Prices in Active Markets of Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |
Assets: |  |  |  |  |  |  |  |  |  |
Cash equivalents and investments: |  |  |  |  |  |  |  |  |  |
Money market fund |  | $ | 4,384 |  | $ | 4,384 |  | $ | — |
Certificates of deposit |  |  | 6,645 |  |  | — |  |  | 6,645 |
Corporate bonds |  |  | 12,816 |  |  | — |  |  | 12,816 |
Total |  | $ | 23,845 |  | $ | 4,384 |  | $ | 19,461 |
Liabilities |  | $ | — |  | $ | — |  | $ | — |

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- Definition Tabular disclosure of fair value of investments in debt and equity securities in an unrealized loss position categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Tabular disclosure of the components of cash, cash equivalents, and short-term investments. Short-term investments may include current marketable securities. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 + Details
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