Balance Sheet Details (Schedule of Accumulated Other Comprehensive Income) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 100,822
Ending balance	106,101
Accumulated Other Comprehensive Income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	5,400
Other comprehensive income before reclassification	5,131
Amounts reclassified from accumulated other comprehensive income (loss)	1,545
Net other comprehensive income	6,676
Ending balance	12,076
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	7,826
Other comprehensive income before reclassification	5,131
Amounts reclassified from accumulated other comprehensive income (loss)	0
Net other comprehensive income	5,131
Ending balance	12,957
Pension and Defined Benefit Plan
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(2,426)
Other comprehensive income before reclassification	0
Amounts reclassified from accumulated other comprehensive income (loss)	1,545
Net other comprehensive income	1,545
Ending balance	$ (881)