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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 248,681,000  
Other comprehensive income (loss), net of tax 2,013,000 $ (2,589,000)
Amounts reclassified from other comprehensive income (loss), net of tax 0 0
Ending balance 274,976,000 248,681,000
AOCI Attributable to Parent [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (7,441,000) (4,852,000)
Ending balance (5,428,000) (7,441,000)
Unrealized Gain (Loss) on Short-Term Investments [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance 528,000 332,000
Other comprehensive income (loss), net of tax 218,000 196,000
Amounts reclassified from other comprehensive income (loss), net of tax 0 0
Ending balance 746,000 528,000
Foreign Currency Translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (7,969,000) (5,184,000)
Other comprehensive income (loss), net of tax 1,795,000 (2,785,000)
Amounts reclassified from other comprehensive income (loss), net of tax 0 0
Ending balance $ (6,174,000) $ (7,969,000)