Income Taxes (Reconciliation of Effective Tax Rate) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory tax rate	21.00%	21.00%	35.00%
State income taxes, net of federal benefit	0.60%	0.80%	(3.20%)
Non-U.S. income taxed at different rates	0.50%	0.80%	(4.30%)
(Increase) decrease in valuation allowance	(19.90%)	(3.60%)	0.10%
Impact of 2017 Tax Cuts and Jobs Act	0	0	(0.642)
Net operating loss carryback adjustment	0.00%	0.00%	0.00%
Reduction in tax benefit related to stock-based awards	(0.10%)	(1.00%)	(16.90%)
Non-deductible expenditures and goodwill	0.00%	(9.00%)	(3.90%)
Research and development credit	0.20%	0.30%	3.60%
Other	(2.00%)	(0.40%)	0.10%
Effective income tax rate	0.30%	8.90%	(53.70%)