Fair Value Measurements (Schedule Of Fair Values Of Financial Instruments Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Total assets	$ 127,751	$ 7,797
Business Combination, Contingent Consideration, Liability		17,450
Derivative Liability	958	958
Financial Liabilities Fair Value Disclosure	958	18,408
Money Market Funds [Member]
Cash	127,751	7,737
Certificates of Deposit [Member]
Investments		60
Level 1 [Member]
Total assets	127,751	7,737
Business Combination, Contingent Consideration, Liability		0
Derivative Liability	0	0
Financial Liabilities Fair Value Disclosure	0	0
Level 1 [Member] | Money Market Funds [Member]
Cash	127,751	7,737
Level 1 [Member] | Certificates of Deposit [Member]
Investments		0
Level 2 [Member]
Total assets	0	60
Business Combination, Contingent Consideration, Liability		0
Derivative Liability	958	958
Financial Liabilities Fair Value Disclosure	958	958
Level 2 [Member] | Money Market Funds [Member]
Cash	0	0
Level 2 [Member] | Certificates of Deposit [Member]
Investments		60
Level 3 [Member]
Total assets	0	0
Business Combination, Contingent Consideration, Liability	0	17,450
Derivative Liability	0	0
Financial Liabilities Fair Value Disclosure	0	17,450
Level 3 [Member] | Money Market Funds [Member]
Cash	$ 0	0
Level 3 [Member] | Certificates of Deposit [Member]
Investments		$ 0