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Debt - Summary of Convertible Senior Notes (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Aug. 31, 2019 | Aug. 31, 2017 | Jun. 30, 2014
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Value of debt outstanding | $ 42,257 | $ 52,658 |  |  |
4.875% convertible senior notes due 2020 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 4.875% | 4.875% |  |  | 4.875%
Value of debt outstanding | $ 0 | $ 1,905 | $ 111,100 |  |
3.25% convertible senior notes due 2023 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate | 3.25% | 3.25% |  | 3.25% |
Value of debt outstanding | $ 42,257 | $ 50,753 |  |  |
3.25% convertible senior notes due 2023 | Carrying Amount |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Value of debt outstanding | $ 30,700 | $ 37,600 |  |  |

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