Fair value of financial instruments Additional Information (Details) - USD ($)
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3 Months Ended |
6 Months Ended |
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Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Sep. 30, 2019 |
Aug. 31, 2019 |
Jun. 30, 2019 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Realized gain (loss) on non-marketable equity securities |
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$ 62,000
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| Unrealized gain (loss) on non-marketable equity securities |
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62,000
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$ 1,259,000
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| Non-marketable equity investments |
$ 458,000
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458,000
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$ 458,000
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| Income related to proportionate share of equity investment |
797,000
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$ 0
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797,000
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$ 0
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| Non-marketable debt investments |
3,500,000
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3,500,000
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$ 0
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| inMarket Media, LLC |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Equity method investment |
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$ 15,600,000
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| Income related to proportionate share of equity investment |
$ 797,000
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$ 797,000
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| Convertible Note Receivable 1 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Convertible notes receivable, interest rate |
6.50%
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6.50%
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| Convertible Note Receivable 2 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Convertible notes receivable, interest rate |
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6.00%
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| Significant Unobservable Inputs | Convertible Note Receivable |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Non-marketable debt investments |
$ 3,500,000
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$ 3,500,000
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| Significant Unobservable Inputs | Convertible Note Receivable 1 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Non-marketable debt investments |
$ 1,500,000
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$ 1,500,000
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| Significant Unobservable Inputs | Convertible Note Receivable 2 |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Non-marketable debt investments |
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$ 2,000,000.0
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