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Convertible Senior Notes and Capped Call Transactions - Narrative (Details) $ / shares in Units, shares in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Dec. 31, 2020 USD ($) day $ / shares shares | Mar. 31, 2019 USD ($) equity_instrument day $ / shares shares | Jun. 30, 2021 USD ($) $ / shares | Mar. 31, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.001 |  | $ 0.001 |  |  | $ 0.001 |  | $ 0.001 |  | $ 0.001
Number of shares of common stock covered by called caps (shares) | shares | 6,880 | 5,960 |  |  |  |  |  |  |  |
Reduction to additional paid-in-capital related to called caps | $ 46,100,000 | $ 23,200,000 |  |  |  |  |  |  |  |
Adjustments to additional paid in capital related to issuance costs attributable to equity component |  |  |  | $ 3,700,000 |  |  |  |  |  |
2024 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Carry amount of equity component of convertible notes |  |  |  |  |  |  |  |  |  | $ 52,900,000
Total deferred issuance costs |  |  |  |  |  |  |  |  |  | 8,600,000
Debt issuance costs attributable to liability |  |  |  |  |  |  |  |  |  | $ 6,600,000
Adjustments to additional paid in capital related to issuance costs attributable to equity component |  | 2,000,000.0 |  |  |  |  |  |  |  |
2026 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Carry amount of equity component of convertible notes | 162,500,000 |  |  |  |  |  |  | $ 162,500,000 |  |
Total deferred issuance costs | 12,200,000 |  |  |  |  |  |  | 12,200,000 |  |
Debt issuance costs attributable to liability | $ 8,500,000 |  |  |  |  |  |  | $ 8,500,000 |  |
Capped calls |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Capped caps initial strike price (in dollars per share) | $ / shares | $ 75.23 |  |  |  |  |  |  | $ 75.23 |  | $ 38.58
Capped caps initial cap price (in dollars per share) | $ / shares | $ 105.58 |  |  |  |  |  |  | $ 105.58 |  | $ 57.16
Convertible Debt | 2024 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal |  |  |  |  |  |  |  |  | $ 230,000,000.0 |
Debt instrument stated rate (percent) |  |  |  |  |  |  |  |  | 0.75% |
Aggregate principal from exercise in full of over-allotment options |  |  |  |  |  |  |  |  | $ 30,000,000.0 |
Proceeds from debt offering, net of debt issuance costs |  | $ 221,400,000 |  |  |  |  |  |  |  |
Debt instrument, unit of principal for conversion |  |  |  |  |  |  |  |  |  | $ 1,000
Number of shares per convertible note | equity_instrument |  | 25.9182 |  |  |  |  |  |  |  |
Convertible debt conversion price (in dollars per share) | $ / shares |  | $ 38.58 |  |  |  |  |  |  |  | $ 38.58
Percentage of principal amount paid if repurchase due to fundamental change (percent) |  | 100.00% |  |  |  |  |  |  |  |
Threshold trading days in consideration of note conversion | day |  | 20 |  |  |  |  |  |  |  |
Threshold consecutive trading days in analysis of conversion price | day |  | 30 |  |  |  |  |  |  |  |
Threshold percentage of stock price if converted |  | 130.00% |  |  |  |  |  |  |  |
Threshold for five day period, product of sale price of common stock and conversion rate of notes |  | 98.00% |  |  |  |  |  |  |  |
Remaining amortization period for debt discount and debt issuance costs |  |  |  |  |  | 2 years 8 months 12 days |  |  |  |
Effective interest rate (percent) |  |  |  |  |  | 0.0405% |  |  |  |
Convertible Debt | 2026 Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate principal | $ 517,500,000 |  |  |  |  |  |  | $ 517,500,000 |  |
Debt instrument stated rate (percent) | 0.00% |  |  |  |  |  |  | 0.00% |  |
Aggregate principal from exercise in full of over-allotment options | $ 67,500,000 |  |  |  |  |  |  | $ 67,500,000 |  |
Proceeds from debt offering, net of debt issuance costs |  |  |  |  |  |  |  | 505,300,000 |  |
Debt instrument, unit of principal for conversion | $ 1,000 |  |  |  |  |  |  | $ 1,000 |  |
Number of shares per convertible note | 13.2933 |  |  |  |  |  |  |  |  |
Convertible debt conversion price (in dollars per share) | $ / shares | $ 75.23 |  |  |  |  |  |  | $ 75.23 |  |
Percentage of principal amount paid if repurchase due to fundamental change (percent) | 100.00% |  |  |  |  |  |  |  |  |
Threshold trading days in consideration of note conversion | day | 20 |  |  |  |  |  |  |  |  |
Threshold consecutive trading days in analysis of conversion price | day | 30 |  |  |  |  |  |  |  |  |
Threshold percentage of stock price if converted | 130.00% |  |  |  |  |  |  |  |  |
Threshold for five day period, product of sale price of common stock and conversion rate of notes | 98.00% |  |  |  |  |  |  |  |  |
Remaining amortization period for debt discount and debt issuance costs |  |  |  |  |  | 5 years 4 months 24 days |  |  |  |
Effective interest rate (percent) |  |  |  |  |  | 0.0605% |  |  |  |
Convertible Debt | Convertible Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Carry amount of equity component of convertible notes |  |  | $ 215,434,000 |  |  | $ 215,434,000 |  |  |  |
Interest expense |  |  | $ 9,307,000 |  | $ 3,143,000 | $ 18,465,000 | $ 6,239,000 |  |  |

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