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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period $ 248,681,000  
Other comprehensive income (loss), net of tax 285,000 $ (513,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0
Balance at end of period 255,254,000  
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period (7,441,000) (4,852,000)
Balance at end of period (7,156,000) (5,365,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period 528,000 332,000
Other comprehensive income (loss), net of tax 56,000 22,000
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0
Balance at end of period 584,000 354,000
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Balance at beginning of period (7,969,000) (5,184,000)
Other comprehensive income (loss), net of tax 229,000 (535,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax 0 0
Balance at end of period $ (7,740,000) $ (5,719,000)