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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

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