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v3.20.1

Subsequent Events (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 10, 2020 USD ($) | Feb. 10, 2020 USD ($) shares | Feb. 10, 2020 USD ($) trading_day | Feb. 10, 2020 USD ($) | Feb. 10, 2020 USD ($) business_day | Apr. 15, 2019 USD ($) business_day | Dec. 31, 2019 USD ($) trading_day | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) business_day
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Description of event of default, aggregate principal amount of final judgments |  |  |  |  |  | $ 10,000,000 |  |  |
Description of event of default, final judgment payment period | business_day |  |  |  |  |  | 60 |  |  |
Percentage of principal amount due if event of default occurs (at least) |  |  |  |  |  | 25.00% |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issued |  |  |  |  |  | $ 80,000,000.0 | $ 80,000,000 | $ 80,000,000 | $ 80,000,000
Convertible Debt | Convertible Senior Notes Due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.50% |  |  |
Trading days | trading_day |  |  |  |  |  |  | 20 |  |
Consecutive trading days | business_day |  |  |  |  |  |  |  |  | 30
Convertible debt, measurement period |  |  |  |  |  |  | 5 |  | 5
Convertible debt, measurement period percentage |  |  |  |  |  |  |  | 98.00% |
Convertible Debt | Subsequent event | Convertible Senior Notes Due 2026 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issued | $ 120,000,000 | $ 120,000,000 | $ 120,000,000 | $ 120,000,000 | $ 120,000,000 |  |  |  |
Stated interest rate | 2.875% | 2.875% | 2.875% | 2.875% | 2.875% |  |  |  |
Net proceeds from issuance and sale of notes | $ 115,900,000 |  |  |  |  |  |  |  |
Trading days | trading_day |  |  | 20 |  |  |  |  |  |
Consecutive trading days | business_day |  |  |  |  | 30 |  |  |  |
Percentage of conversion price |  |  |  | 130.00% |  |  |  |  |
Convertible debt, measurement period |  |  | 5 |  | 5 |  |  |  |
Convertible debt, measurement period percentage |  |  |  | 98.00% |  |  |  |  |
Description of event of default, aggregate principal amount of final judgments | 15,000,000.0 |  |  |  |  |  |  |  |
Description of event of default, final judgment payment period | business_day |  |  |  |  | 60 |  |  |  |
Percentage of principal amount due if event of default occurs (at least) |  |  |  | 25.00% |  |  |  |  |
Convertible Debt | Subsequent event | Convertible Senior Notes Due 2024 |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |
Debt issued | 13,750,000.00 | $ 13,750,000.00 | $ 13,750,000.00 | $ 13,750,000.00 | $ 13,750,000.00 |  |  |  |
Repayments of convertible debt | 66,250,000 |  |  |  |  |  |  |  |
Number of shares of common stock used to repurchase (in shares) | shares |  | 722,423 |  |  |  |  |  |  |
Common stock to repurchased | $ 66,250,000 | $ 66,250,000 | $ 66,250,000 | $ 66,250,000 | $ 66,250,000 |  |  |  |

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