Balance Sheet Details (Schedule of Accumulated Other Comprehensive Income) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 106,101
Other comprehensive income recognized in connection with divestiture	(10,120)
Ending balance	90,591
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	12,076
Other comprehensive income (loss) before reclassification	(1,694)
Amounts reclassified from accumulated other comprehensive income (loss)	(558)
Other comprehensive income recognized in connection with divestiture	(10,120)
Total change in accumulated other comprehensive income (loss)	(12,372)
Ending balance	(296)
Foreign Currency Translation Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	12,957
Other comprehensive income (loss) before reclassification	(1,694)
Amounts reclassified from accumulated other comprehensive income (loss)	0
Other comprehensive income recognized in connection with divestiture	(10,869)
Total change in accumulated other comprehensive income (loss)	(12,563)
Ending balance	394
Defined Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(881)
Other comprehensive income (loss) before reclassification	0
Amounts reclassified from accumulated other comprehensive income (loss)	(558)
Other comprehensive income recognized in connection with divestiture	749
Total change in accumulated other comprehensive income (loss)	191
Ending balance	$ (690)