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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2020
Income Tax Disclosure [Abstract]  
Reconciliation of effective tax rate to the U.S. federal statutory tax rate
A reconciliation of the U.S. federal statutory tax rate to the Company’s effective income tax rate is as follows:
 
Three months ended March 31,
 
2020
 
2019
U.S. federal statutory tax rate
21.0
 %
 
21.0
 %
State income taxes, net of federal benefit
(0.1
)
 
0.5

Non-U.S. income taxed at different rates
0.1

 
1.3

Reduction in tax benefit related to stock-based awards
(0.2
)
 
(2.3
)
Non-deductible expenses
(0.1
)
 
(0.6
)
Research and development credit (expense)
0.1

 
0.8

Increase in valuation allowance
(15.0
)
 
(18.5
)
Effect of tax rate differences of NOL carryback
3.0

 
—

Other
—

 
(0.2
)
Effective income tax rate
8.8
 %
 
2.0
 %