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Summary of Significant Accounting Policies (Tables) | 3 Months Ended
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Mar. 31, 2014
Accounting Policies [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | A reconciliation of the federal statutory income tax rate and the estimated effective income tax rate for the periods presented is as follows:
|  | Three Months Ended March 31,
|  | 2014 |  | 2013
Statutory federal tax rate - benefit (expense) |  | 35 | % |  | (35 | )%
Noncontrolling interests in operating subsidiaries |  | (1 | )% |  | — | %
Nondeductible permanent items |  | (3 | )% |  | (5 | )%
Other |  | (1 | )% |  | — | %
Valuation allowance |  | (25 | )% |  | 1 | %
|  | 5 | % |  | (39 | )%
Concentration Risk, Credit Risk, Policy [Policy Text Block] | Concentrations. One licensee individually accounted for 39% of revenues recognized during the three months ended March 31, 2014, and three licensees individually accounted for 65%, 14% and 13% of revenues recognized during the three months ended March 31, 2013. Two licensees individually represented approximately 43% and 28% of accounts receivable at March 31, 2014. Two licensees individually represented approximately 60% and 22% of accounts receivable at December 31, 2013. For the three months ended March 31, 2014, 16% of revenues were attributable to licensees domiciled in foreign jurisdictions. For the three months ended March 31, 2013, 15% 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):
| March 31, 2014
Security Type | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government fixed income securities(1) | $ | 96,573 |  |  | $ | 14 |  |  | $ | (997 | ) |  | $ | 95,590 |
Total short-term investments | $ | 96,573 |  |  | $ | 14 |  |  | $ | (997 | ) |  | $ | 95,590 |
_____________________________________ (1) Maturity dates ranging from 2014 to 2015.
| December 31, 2013
Security Type | Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
U.S. government fixed income securities | $ | 130,971 |  |  | $ | 21 |  |  | $ | (975 | ) |  | $ | 130,017 |
Total short-term investments | $ | 130,971 |  |  | $ | 21 |  |  | $ | (975 | ) |  | $ | 130,017 |

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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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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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