Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ (1,957)	$ (3,003)	$ 4,813
Available-for-sale securities:
Changes in unrealized losses	(465)	(158)	(617)
Reclassification adjustments for losses included in net income (loss)	41	50	17
Net change	(424)	(108)	(600)
Cash flow hedges:
Changes in unrealized gains (losses)	(19)	163	45
Reclassification adjustments for (gains) losses (gains) included in net income (loss)	16	(172)	(1)
Net change	(3)	(9)	44
Change in unrealized components of defined benefit plans:
Gains (losses) arising during the period	29	24	(117)
Amortization of actuarial loss and prior service benefit	19	22	14
Net change	48	46	(103)
Foreign currency translation adjustments, net	(71)	49	74
Other comprehensive income (loss)	(450)	(22)	(585)
Comprehensive income (loss)	$ (2,407)	$ (3,027)	$ 4,228