Income Taxes (Tables)

6 Months Ended

Jun. 30, 2018

Income Tax Disclosure [Abstract]

Summary of Differences Between U.S. Federal Statutory Tax Rate and Company's Consolidated Effective Tax Rate

The differences between the U.S. federal statutory tax rate and the Company’s consolidated effective tax rate is as follows:

	Three Months Ended						Six Months Ended
	June 30,			July 1,			June 30,			July 1,
	2018			2017			2018			2017
U.S. federal statutory tax rate		21.0	%		35.0	%		21.0	%		35.0	%
State income taxes (net of federal benefit)		2.2	%		1.8	%		2.3	%		2.4	%
Cessation of operations		0.0	%		0.4	%		(1.6	%)		(16.0	%)
Research and development credit		(0.1	%)		(1.1	%)		(0.4	%)		(2.2	%)
Tax (windfall) shortfall on share-based awards		(4.5	%)		(0.8	%)		(18.9	%)		0.8	%
Section 162m limitation		0.2	%		0.0	%		0.3	%		0.0	%
Increase in valuation allowance due to net operating loss		0.1	%		0.1	%		0.4	%		1.2	%
Impact of Foreign Ops		2.3	%		0.4	%		2.3	%		0.7	%
Other		0.7	%		0.7	%		0.8	%		1.3	%
Total effective tax rate		21.9	%		36.5	%		6.2	%		23.2	%