CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Net loss	$ (2,392)	$ (5,136)
Other comprehensive income, before tax:
Change in unrealized net gain (loss) on available-for-sale investments	45	(28)
Foreign currency translation gains	61	104
Other comprehensive income, before tax	106	76
Income tax provision related to items in other comprehensive income	0	0
Other comprehensive income, net of tax	106	76
Comprehensive loss	$ (2,286)	$ (5,060)