CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2020		Mar. 29, 2019
Income Statement [Abstract]
Revenue	$ 155,468		$ 157,186
Cost of revenue	91,023		90,897
Gross profit	64,445		66,289
Operating expenses:
Research and development and engineering	15,334		13,997
Selling, general and administrative	30,755		31,847
Amortization of purchased intangible assets	3,445		3,998
Restructuring and acquisition related costs	1,661		2,054
Total operating expenses	51,195		51,896
Operating income	13,250		14,393
Interest income (expense), net	(1,678)		(2,044)
Foreign exchange transaction gains (losses), net	254		41
Other income (expense), net	83		(68)
Income before income taxes	11,909		12,322
Income tax provision (benefit)	(38)		69
Consolidated net income	$ 11,947	[1]	$ 12,253	[2]
Earnings per common share (Note 5):
Basic	$ 0.34	[1]	$ 0.35	[2]
Diluted	$ 0.34	[1]	$ 0.35	[2]
Weighted average common shares outstanding—basic	35,152	[1]	34,958	[2]
Weighted average common shares outstanding—diluted	35,561	[1]	35,474	[2]

[1] 71,166 non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213,219 shares of restricted stock issued to the former Laser Quantum non-controlling interest shareholders are considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of April 3, 2020.

[2] 45,252 non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213,219 shares of restricted stock issued to the former Laser Quantum non-controlling interest shareholders were considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of March 29, 2019.