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Investments (Tables) | 9 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Cost, Gross Unrealized Gains and Losses, and Fair Value of Investments | The cost, gross unrealized gains and losses, and fair value of investments are as follows (in thousands):
| As of December 31, 2021
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  | Fair Value
Cash equivalents: |  |  |  |  |  |  |  |  |
Money market funds | $ | 22,981 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 22,981 |
Total cash equivalents | 22,981 |  |  | — |  |  | — |  |  |  |  | 22,981 |
Marketable securities: |  |  |  |  |  |  |  |  |
Asset-backed securities | 3,569 |  |  | — |  |  | (4) |  |  |  |  | 3,565 |
Certificates of deposit | 137 |  |  | — |  |  | — |  |  |  |  | 137 |
Commercial paper | 2,656 |  |  | — |  |  | (3) |  |  |  |  | 2,653 |
Corporate notes and bonds | 102,529 |  |  | 1 |  |  | (343) |  |  |  |  | 102,187 |
Sovereign bonds | 8,775 |  |  | — |  |  | (84) |  |  |  |  | 8,691 |
U.S. government and agency securities | 568,193 |  |  | — |  |  | (4,927) |  |  |  |  | 563,266 |
Total marketable securities | 685,859 |  |  | 1 |  |  | (5,361) |  |  |  |  | 680,499 |
Total cash equivalents and marketable securities | $ | 708,840 |  |  | $ | 1 |  |  | $ | (5,361) |  |  |  |  | $ | 703,480 |
The cost, gross unrealized gains and losses, and fair value of investments were as follows (in thousands):
| As of March 31, 2021
| Cost or Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  |  |  | Fair Value
Cash equivalents: |  |  |  |  |  |  |  |  |
Commercial paper | $ | 2,290 |  |  | $ | — |  |  | $ | — |  |  |  |  | $ | 2,290 |
Corporate notes and bonds | 3,517 |  |  | — |  |  | (1) |  |  |  |  | 3,516 |
Money market funds | 9,838 |  |  | — |  |  | — |  |  |  |  | 9,838 |
Certificates of deposit | 1,301 |  |  | — |  |  | — |  |  |  |  | 1,301 |
Total cash equivalents | 16,946 |  |  | — |  |  | (1) |  |  |  |  | 16,945 |
Marketable securities: |  |  |  |  |  |  |  |  |
Asset-backed securities | 3,264 |  |  | — |  |  | (1) |  |  |  |  | 3,263 |
Certificates of deposit | 4,867 |  |  | 1 |  |  | — |  |  |  |  | 4,868 |
Commercial paper | 16,411 |  |  | 1 |  |  | — |  |  |  |  | 16,412 |
Corporate notes and bonds | 46,662 |  |  | 3 |  |  | (24) |  |  |  |  | 46,641 |
Sovereign bonds | 1,100 |  |  | — |  |  | (1) |  |  |  |  | 1,099 |
U.S. government and agency securities | 3,857 |  |  | 1 |  |  | — |  |  |  |  | 3,858 |
Total marketable securities | 76,161 |  |  | 6 |  |  | (26) |  |  |  |  | 76,141 |
Total cash equivalents and marketable securities | $ | 93,107 |  |  | $ | 6 |  |  | $ | (27) |  |  |  |  | $ | 93,086 |
Contractual Maturities of Available-For-Sale Debt Securities | As of December 31, 2021, the contractual maturities of the Company’s available-for-sale debt securities were as follows (in thousands):
| Fair Value
Due within one year | $ | 93,412 |
Due in one year to three years | 610,068 |
Total | $ | 703,480 |
As of March 31, 2021, the contractual maturities of the Company’s available-for-sale debt securities were as follows (in thousands):
| Fair Value
Due within one year | $ | 72,307 |
Due in one year to three years | 20,779 |
Total | $ | 93,086 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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