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Summary of Significant Accounting Policies Concentration Risk (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Concentrations |  |  |
Effective Income Tax Rate Reconciliation, Percent | (8.00%) | 1.00% |
Licensee 1 [Member] |  |  |
Concentrations |  |  |
Concentration Risk, Percentage - Accounts Receivable | 52.00% |  | 38.00%
Licensee 1 [Member] | License Revenues [Member] |  |  |
Concentrations |  |  |
Concentration Risk, Percentage - Revenues | 70.00% | 96.00% |
Licensee 2 [Member] |  |  |
Concentrations |  |  |
Concentration Risk, Percentage - Accounts Receivable | 25.00% |  | 36.00%
Licensee 2 [Member] | License Revenues [Member] |  |  |
Concentrations |  |  |
Concentration Risk, Percentage - Revenues | 21.00% |  |
Licensee 3 [Member] |  |  |
Concentrations |  |  |
Concentration Risk, Percentage - Accounts Receivable | 10.00% |  | 12.00%
Licensee 4 [Member] |  |  |
Concentrations |  |  |
Concentration Risk, Percentage - Accounts Receivable |  |  | 11.00%
Licensees in foreign jurisdictions [Member] | License Revenues [Member] |  |  |
Concentrations |  |  |
Concentration Risk, Percentage - Revenues | 75.00% | 2.00% |

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