Summary of Significant Accounting Policies Concentration Risk (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Concentrations
Effective Income Tax Rate Reconciliation, Percent	(1.00%)	(12.00%)	1.00%	11.00%
Licensee 1 [Member]
Concentrations
Concentration Risk, Percentage - Accounts Receivable	47.00%		47.00%		100.00%
Licensee 1 [Member] | License Revenues [Member]
Concentrations
Concentration Risk, Percentage - Revenues	48.00%	85.00%	87.00%	55.00%
Licensee 2 [Member]
Concentrations
Concentration Risk, Percentage - Accounts Receivable	43.00%		43.00%
Licensee 2 [Member] | License Revenues [Member]
Concentrations
Concentration Risk, Percentage - Revenues	42.00%			26.00%
Licensees in foreign jurisdictions [Member] | License Revenues [Member]
Concentrations
Concentration Risk, Percentage - Revenues	43.00%	90.00%	6.00%	87.00%