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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2019 USD ($) Client | Mar. 31, 2018 Client | Mar. 31, 2019 USD ($) Client | Mar. 31, 2018 Client | Jun. 30, 2018 USD ($) Client
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Money market funds | $ | $ 11.1 |  | $ 11.1 |  | $ 10.9
Restricted cash as collateral for letters of credit | $ | 0.0 |  | 0.0 |  | $ 0.9
AmOne Corp [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Business combination, post-closing payments | $ | $ 7.7 |  | $ 7.7 |  |
Customer Concentration Risk [Member] | Net revenue [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of clients accounted for more than 10% of net revenue | 1 | 1 | 1 | 1 |
Concentration risk percentage accounted by major clients | 23.00% | 22.00% | 23.00% | 23.00% |
Number of other clients accounted for more than 10% of net revenue | 0 | 0 | 0 | 0 |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of other clients accounted for more than 10% of net accounts receivable |  |  | 0 |  | 0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Client Two [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage accounted by major clients |  |  | 16.00% |  | 13.00%
Number of clients accounted for 10% or more than 10% of net accounts receivable |  |  | 1 |  | 1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Client One [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Concentration risk percentage accounted by major clients |  |  |  |  | 13.00%
Number of clients accounted for more than 10% of net accounts receivable |  |  |  |  | 1

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