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v3.21.2

Long-term Debt - 2025 Notes (Details) - 2025 Notes $ / shares in Units, shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2018 USD ($) shares $ / shares | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Oct. 24, 2018 USD ($) | Oct. 22, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs | $ 5,900,000 |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount | $ 172,500,000 | $ 172,500,000 |  | $ 172,500,000 |  | $ 172,500,000 | $ 22,500,000 | $ 150,000,000.0
Interest rate | 1.50% |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 166,600,000 |  |  |  |  |  |  |
Debt issuance costs | $ 3,400,000 |  |  |  |  |  |  |
Interest expense |  | 700,000 | $ 1,300,000 | 700,000 | $ 1,300,000 |  |  |
Conversion price (in dollars per share) | $ / shares | $ 33.43 |  |  |  |  |  |  |
Initial conversion amount (in shares) | shares | 5.2 |  |  |  |  |  |  |
Carrying amount | $ 100,700,000 |  |  |  |  |  |  |
Non-cash amortization of debt discount and debt issuance costs |  | $ 2,400,000 | $ 2,100,000 | $ 4,800,000 | $ 4,300,000 |  |  |
Repurchase covenant, repurchase price due to fundamental change as percentage of principal amount | 100.00% |  |  |  |  |  |  |
Repurchase covenant, sale price as a percentage of conversion price (at least) | 130.00% |  |  |  |  |  |  |
Repurchase covenant, trading days, minimum | 20 days |  |  |  |  |  |  |
Repurchase covenant, consecutive trading days, minimum | 30 days |  |  |  |  |  |  |
Repurchase covenant, repurchase price due to change in sale price as percentage of conversion price | 100.00% |  |  |  |  |  |  |
Senior Notes | Common Stock |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 71,800,000 |  |  |  |  |  |  |
Debt issuance costs | $ 2,500,000 |  |  |  |  |  |  |
Senior Notes | Class A Common Stock | Common Stock |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Initial conversion rate per $ 1000 principal amount | 0.0299135 |  |  |  |  |  |  |

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