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v3.20.4

Debt - Additional Information (Details) $ / shares in Units, shares in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 01, 2020 USD ($) $ / shares shares | Apr. 23, 2020 USD ($) | May 31, 2020 USD ($) shares | Aug. 31, 2018 USD ($) day $ / shares shares | Dec. 31, 2020 USD ($) day | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from convertible debt |  |  |  |  |  | $ 222,799,000 | $ 0 | $ 223,121,000
Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term line of credit |  |  |  |  | $ 8,100,000 | $ 8,100,000 |  |
2023 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Strike price (in dollars per share) | $ / shares |  |  |  |  |  | $ 41.59 |  |
2023 Notes | Call Option |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Strike price (in dollars per share) | $ / shares |  |  |  | $ 41.59 |  |  |  |
Cap price (in dollars per share) | $ / shares | $ 63.98 |  |  |  |  |  |  |
Option indexed to issuer's equity (in shares) | shares |  |  |  | 5.5 |  |  |  |
Equity component of convertible debt, subsequent adjustments |  |  |  | $ 26,900,000 |  |  |  |
2025 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Strike price (in dollars per share) | $ / shares |  |  |  |  |  | $ 61.02 |  |
2025 Notes | Call Option |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Strike price (in dollars per share) | $ / shares | 61.02 |  |  |  |  |  |  |
Cap price (in dollars per share) | $ / shares | $ 93.88 |  |  |  |  |  |  |
Option indexed to issuer's equity (in shares) | shares | 3.8 |  |  |  |  |  |  |
Equity component of convertible debt, subsequent adjustments | $ 27,300,000 |  |  |  |  |  |  |
Credit Agreement | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.50% |  |  |  |  |  |
Credit Agreement | Base Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.00% |  |  |  |  |  |
Credit Agreement | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |  |
Credit Agreement | Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Current borrowing capacity |  | $ 30,000,000.0 | $ 50,000,000.0 |  |  |  |  |
Credit sublimit |  | 15,000,000.0 |  |  |  |  |  |
Fee amount |  | $ 400,000 |  |  |  |  |  |
Commitment fee percentage |  | 0.20% |  |  |  |  |  |
Credit Agreement | Letter of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 70,000,000.0 |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Carrying amount of equity component |  |  |  |  | 99,026,000 | $ 99,026,000 | 99,026,000 |
Debt issuance costs, net |  |  |  |  | $ 8,059,000 | $ 8,059,000 |  |
Convertible Debt | Debt Covenant One |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | day |  |  |  | 20 |  |  |  |
Threshold consecutive trading days | day |  |  |  | 30 |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |
Convertible Debt | Debt Covenant Two |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | day |  |  |  | 5 |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 98.00% |  |  |  |
Convertible Debt | Debt Covenant Three |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |
Redemption price, percentage |  |  |  | 100.00% |  |  |  |
Convertible Debt | 2023 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 230,000,000.0 |  |  |  |
Stated interest percentage |  |  |  | 1.25% | 1.25% | 1.25% |  |
Proceeds from convertible debt |  |  |  | $ 223,100,000 |  |  |  |
Carrying amount of equity component |  |  |  | 53,800,000 | $ 52,194,000 | $ 52,194,000 | 52,194,000 |
Debt issuance costs, net |  |  |  | 6,900,000 | $ 3,009,000 | $ 3,009,000 | 4,032,000 |
Liability component |  |  |  | 5,300,000 |  |  |  |
Convertible, issuance costs of equity component |  |  |  | $ 1,600,000 |  |  |  |
Interest rate, effective percentage |  |  |  | 7.36% |  |  |  |
Equity component of convertible debt, subsequent adjustments |  |  |  | $ 26,910,000 |  |  |  |
Convertible Debt | 2023 Notes | Call Option |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Option indexed to issuer's equity (in shares) | shares |  |  |  | 5.5 |  |  |  |
Convertible Debt | 2023 Notes | Debt Covenant Three |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | day |  |  |  | 20 |  |  |  |
Threshold consecutive trading days | day |  |  |  | 30 |  |  |  |
Redemption price, percentage |  |  |  | 100.00% |  |  |  |
Convertible Debt | 2025 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 230,000,000.0 |  |  |  |
Stated interest percentage |  |  |  | 2.25% | 2.25% | 2.25% |  |
Proceeds from convertible debt |  |  |  | $ 222,800,000 |  |  |  |
Carrying amount of equity component | 48,300,000 |  |  |  | $ 46,832,000 | $ 46,832,000 | $ 46,832,000 |
Debt issuance costs, net | 7,200,000 |  |  |  | $ 5,050,000 | $ 5,050,000 |  |
Liability component | 5,700,000 |  |  |  |  |  |  |
Convertible, issuance costs of equity component | $ 1,500,000 |  |  |  |  |  |  |
Interest rate, effective percentage |  |  |  | 7.85% |  |  |  |
Equity component of convertible debt, subsequent adjustments |  |  |  | $ 27,255,000 |  |  |  |
Convertible Debt | 2025 Notes | Call Option |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Option indexed to issuer's equity (in shares) | shares |  |  | 3.8 |  |  |  |  |
Convertible Debt | The Notes | Debt Covenant Three |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Threshold trading days | day |  |  |  |  | 20 |  |  |
Threshold consecutive trading days | day |  |  |  |  | 30 |  |  |
Threshold percentage of stock price trigger |  |  |  |  | 130.00% |  |  |

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