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Summary of Significant Accounting Policies (Tables) | 9 Months Ended
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Sep. 30, 2013
Accounting Policies [Abstract] |
Concentration Risk, Credit Risk, Policy [Policy Text Block] | Concentrations. Three licensees individually accounted for 34%, 31% and 19% of revenues recognized during the three months ended September 30, 2013, and two licensees accounted for 43% and 17% of revenues recognized during the nine months ended September 30, 2013. Five licensees individually accounted for 30%, 13%, 10%, 10% and 10% of revenues recognized during the three months ended September 30, 2012 and four licensees accounted for 29%, 20%, 11% and 10% of revenues recognized during the nine months ended September 30, 2012. Four licensees individually represented approximately 32%, 27%, 18% and 16% of accounts receivable at September 30, 2013. Three licensees individually represented approximately 34%, 30%, and 25% of accounts receivable at December 31, 2012. For the three and nine months ended September 30, 2013, 54% and 26%, respectively, of revenues were attributable to licensees domiciled in foreign jurisdictions. For the three and nine months ended September 30, 2012, 12% and 45%, respectively, of revenues were attributable to licensees domiciled in foreign jurisdictions.
Marketable Securities | Short-term marketable securities for the periods presented were comprised of the following (in thousands):
| September 30, 2013
Security Type | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government fixed income securities(1) | $ | 167,788 |  |  | $ | 60 |  |  | $ | (850 | ) |  | $ | 166,998 |
Total short-term investments | $ | 167,788 |  |  | $ | 60 |  |  | $ | (850 | ) |  | $ | 166,998 |
(1) Maturity dates ranging from 2013 to 2014.
| December 31, 2012
Security Type | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government fixed income securities | $ | 87,394 |  |  | $ | 20 |  |  | $ | (411 | ) |  | $ | 87,003 |
Equity securities of certain technology companies | 3,254 |  |  | — |  |  | (782 | ) |  | 2,472 |
Total short-term investments | $ | 90,648 |  |  | $ | 20 |  |  | $ | (1,193 | ) |  | $ | 89,475 |

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- Definition Disclosure of accounting policy for credit risk. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 825 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28088331&loc=SL29635902-196195 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6875567&loc=d3e14489-108613 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61082-112788 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 825 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6480020&loc=d3e61044-112788 + Details
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