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Cash and Cash Equivalents, and Investments - Strategic Investment (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2017
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Gain on sale of strategic equity investments |  |  | $ 7,158 | $ 0 | $ 12,496 | $ 0 |  |  |
Proceeds from sale of strategic equity investments |  |  |  |  | 16,076 | 0 |  |  |
Impairment charge |  |  |  |  | $ 0 | $ 10,000 |  |  |
TAPD, Inc. |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Cost method investment |  |  |  |  |  |  |  | $ 2,000 |
Consideration received on sale | $ 9,200 |  |  |  |  |  |  |  |
Gain on sale of strategic equity investments | 7,200 |  |  |  |  |  |  |  |
Proceeds from sale of strategic equity investments | $ 9,000 |  |  |  |  |  |  |  |
Foreign Entity |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Cost method investment |  |  |  |  |  |  |  |  | $ 3,000
Consideration received on sale |  | $ 8,300 |  |  |  |  |  |  |
Gain on sale of strategic equity investments |  | 5,300 |  |  |  |  |  |  |
Proceeds from sale of strategic equity investments |  | $ 7,100 |  |  |  |  |  |  |
WayUp, Inc. |  |  |  |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  | $ 10,000 |  |

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