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Description of Business and Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total accumulated other comprehensive loss at beginning of period $ (393) $ (284) $ (468) $ (611)
Total accumulated other comprehensive loss at end of period (47) (490) (47) (490)
Unrealized Gains on Investments [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total accumulated other comprehensive loss at beginning of period (19) 2 (21) (39)
Other comprehensive income before reclassifications 4 13 6 54
Amounts reclassified from accumulated other comprehensive income/expense to other income on the statement of operations and comprehensive loss
Total accumulated other comprehensive loss at end of period (15) 15 (15) 15
Foreign Currency Translation Adjustment [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Total accumulated other comprehensive loss at beginning of period (374) (286) (447) (572)
Other comprehensive income before reclassifications 373 (229) 425 52
Amounts reclassified from accumulated other comprehensive income/expense to other income on the statement of operations and comprehensive loss (31) 10 (10) 15
Total accumulated other comprehensive loss at end of period $ (32) $ (505) $ (32) $ (505)