Balance Sheet Details (Schedule of Accumulated Other Comprehensive Income) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Accumulated Other Comprehensive Income [Roll Forward]
Balance as of December 31, 2017	$ 106,101
Balance as of March 31, 2018	103,066
Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Balance as of December 31, 2017	12,076
Other comprehensive income before reclassification	1,437
Amounts reclassified from accumulated other comprehensive income	19
Net other comprehensive income for the three months ended March 31, 2018	1,456
Balance as of March 31, 2018	13,532
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Balance as of December 31, 2017	12,957
Other comprehensive income before reclassification	1,437
Amounts reclassified from accumulated other comprehensive income	0
Net other comprehensive income for the three months ended March 31, 2018	1,437
Balance as of March 31, 2018	14,394
Defined Benefit Pension Plan
Accumulated Other Comprehensive Income [Roll Forward]
Balance as of December 31, 2017	(881)
Other comprehensive income before reclassification	0
Amounts reclassified from accumulated other comprehensive income	19
Net other comprehensive income for the three months ended March 31, 2018	19
Balance as of March 31, 2018	$ (862)