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Income Taxes - Reconciliation of Statutory Rate (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Reconciliation of the statutory tax rates and the effective tax rates      
Statutory rate 35.00% 35.00% 35.00%
State taxes, net of federal benefit 1.00% 3.00% 1.00%
Effect of rates different than statutory (2.00%) (2.00%) (10.00%)
Minority interest (1.00%) (4.00%) (1.00%)
Non-deductible stock based compensation (2.00%) 0.00% 0.00%
Other permanent adjustments (2.00%) (1.00%) (6.00%)
Research and development credit (0.00%) 2.00% 5.00%
Change in valuation allowance (7.00%) (3.00%) (10.00%)
Other (2.00%) (1.00%) (3.00%)
Tax Reform Rate Reduction (3.00%) 0.00% 0.00%
Acquisitions and restructuring related taxes (2.00%) (3.00%) (5.00%)
Net 15.00% 26.00% 6.00%