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Cash, Cash Equivalents and Investments with Hierarchy (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Amortized Costs $ 152,716 $ 175,191
Gross Unrealized Gains 10 73
Gross Unrealized Loss (464) (275)
Estimated Fair Value 152,262 174,989
Cash and cash equivalents 31,703 41,030
Short-term marketable investments 120,559 133,959
Investments due within one year 69,721  
Investments due after one year 50,838  
Level 1    
Amortized Costs 31,703 43,030
Gross Unrealized Gains 0 0
Gross Unrealized Loss 0 (194)
Estimated Fair Value 31,703 42,836
Cash and cash equivalents 31,703 41,030
Short-term marketable investments 0 1,806
Level 2    
Amortized Costs 121,013 132,161
Gross Unrealized Gains 10 73
Gross Unrealized Loss (464) (81)
Estimated Fair Value 120,559 132,153
Cash and cash equivalents 0 0
Short-term marketable investments 120,559 132,153
Level 3    
Amortized Costs   0
Gross Unrealized Gains   0
Gross Unrealized Loss   0
Estimated Fair Value   148
Cash and cash equivalents   0
Short-term marketable investments   0
Liabilities, Fair Value Disclosure   148
Cash    
Amortized Costs 16,499 29,122
Gross Unrealized Gains 0 0
Gross Unrealized Loss 0 0
Estimated Fair Value 16,499 29,122
Cash and cash equivalents 16,499 29,122
Short-term marketable investments 0 0
Money Market Funds | Level 1    
Amortized Costs 15,204 11,908
Gross Unrealized Gains 0 0
Gross Unrealized Loss 0 0
Estimated Fair Value 15,204 11,908
Cash and cash equivalents 15,204 11,908
Short-term marketable investments 0 0
Mutual Funds | Level 1    
Amortized Costs   2,000
Gross Unrealized Gains   0
Gross Unrealized Loss   (194)
Estimated Fair Value   1,806
Cash and cash equivalents   0
Short-term marketable investments   1,806
Commercial Paper | Level 2    
Amortized Costs 13,254 19,144
Gross Unrealized Gains 0 8
Gross Unrealized Loss (8) 0
Estimated Fair Value 13,246 19,152
Cash and cash equivalents 0 0
Short-term marketable investments 13,246 19,152
Corporate Debt | Level 2    
Amortized Costs 70,631 83,995
Gross Unrealized Gains 6 61
Gross Unrealized Loss (296) (58)
Estimated Fair Value 70,341 83,998
Cash and cash equivalents 0 0
Short-term marketable investments 70,341 83,998
Municipal Securities | Level 2    
Amortized Costs 3,385  
Gross Unrealized Gains 3  
Gross Unrealized Loss (1)  
Estimated Fair Value 3,387  
Cash and cash equivalents 0  
Short-term marketable investments 3,387  
Asset-backed Securities | Level 2    
Amortized Costs 27,063 26,906
Gross Unrealized Gains 1 4
Gross Unrealized Loss (119) (22)
Estimated Fair Value 26,945 26,888
Cash and cash equivalents 0 0
Short-term marketable investments 26,945 26,888
Mortgage backed Securities | Level 2    
Amortized Costs   116
Gross Unrealized Gains   0
Gross Unrealized Loss   (1)
Estimated Fair Value   115
Cash and cash equivalents   0
Short-term marketable investments   115
Agency Bond | Level 2    
Amortized Costs 4,183 2,000
Gross Unrealized Gains 0 0
Gross Unrealized Loss (35) 0
Estimated Fair Value 4,148 2,000
Cash and cash equivalents 0 0
Short-term marketable investments 4,148 2,000
International Government Securities | Level 2    
Amortized Costs 2,497  
Gross Unrealized Gains 0  
Gross Unrealized Loss (5)  
Estimated Fair Value 2,492  
Cash and cash equivalents 0  
Short-term marketable investments $ 2,492  
Contingent Consideration | Level 3    
Amortized Costs   0
Gross Unrealized Gains   0
Gross Unrealized Loss   0
Estimated Fair Value   148
Cash and cash equivalents   0
Short-term marketable investments   0
Liabilities, Fair Value Disclosure   $ 148