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4. BALANCE SHEET DETAIL - Property and equipment, net (Details) - USD ($) | 12 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019
Property and equipment, net: |  |  |
Property and equipment, gross | $ 31,070,000 | $ 30,888,000 |
Less: Accumulated depreciation | (23,742,000) | (22,769,000) |
Total property and equipment, net | 7,328,000 | 8,119,000 |
Depreciation | 981,000 | 1,200,000 | $ 1,200,000
Computer and other equipment |  |  |
Property and equipment, net: |  |  |
Property and equipment, gross | 18,359,000 | 18,191,000 |
Software |  |  |
Property and equipment, net: |  |  |
Property and equipment, gross | 4,097,000 | 4,086,000 |
Land |  |  |
Property and equipment, net: |  |  |
Property and equipment, gross | 3,900,000 | 3,900,000 |
Building and building improvements |  |  |
Property and equipment, net: |  |  |
Property and equipment, gross | 3,735,000 | 3,735,000 |
Furniture and fixtures |  |  |
Property and equipment, net: |  |  |
Property and equipment, gross | 102,000 | 102,000 |
Leasehold improvements |  |  |
Property and equipment, net: |  |  |
Property and equipment, gross | $ 877,000 | $ 874,000 |

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