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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Significant Accounting Policies [Line Items] |  |  |
Restricted cash | $ 125 | $ 165 |
Deposits | 159 | 132 |
Software costs capitalized | 1,453 | 1,544 | $ 1,641
Foreign currency translation loss | $ 235 | 31 | 4
Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Intangible assets acquired, useful life | 5 years |  |
Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Intangible assets acquired, useful life | 18 years |  |
Leasehold improvements | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 8 years |  |
Leasehold improvements | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 10 years |  |
Other assets | Minimum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 3 years |  |
Other assets | Maximum |  |  |
Significant Accounting Policies [Line Items] |  |  |
Property and equipment, estimated useful lives | 5 years |  |
O&O |  |  |
Significant Accounting Policies [Line Items] |  |  |
Advertising expense | $ 200 | $ 135 | $ 83
Customer A | Accounts Receivable |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk | 11.60% | 25.70% |
Customer A | Sales |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk | 15.30% | 28.60% | 23.50%
Customer B | Accounts Receivable |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk | 11.50% |  |
Customer B | Sales |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk |  |  | 16.10%
Carrier Partner A | Sales |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk | 37.30% | 45.90% |
Carrier Partner B | Sales |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk | 30.00% | 38.70% |
Carrier Partner C | Sales |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk | 10.70% |  |

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