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Convertible Senior Notes - Conversion (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 10, 2020 | May 31, 2020 | Mar. 31, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | May 18, 2020 | Dec. 31, 2019
Convertible Senior Notes |  |  |  |  |  |  |
Net proceeds | $ 25,000 |  |  | $ 27,678 | $ 25,609 |  |
5.5% Convertible Senior Notes |  |  |  |  |  |  |
Convertible Senior Notes |  |  |  |  |  |  |
Principal amount |  | $ 1,000 | $ 100,000 | 33,660 |  | $ 100,000 | $ 100,000
Less initial purchasers' discount |  | (3,300) | (3,250) |  |  |  |
Less cost of related capped call and common stock forward |  |  | (43,500) |  |  |  |
Less other issuance costs |  | $ (900) | (894) | $ (1,700) |  |  |
Net proceeds |  |  | $ 52,356 |  |  |  |

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