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Fair Value Measurements - Financial Instruments Measured on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019 | Aug. 31, 2017
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Fair Value Measurements, Recurring | Redeemable Preferred Stock | Level 1 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Financial liability | $ 0 | $ 0 |
Fair Value Measurements, Recurring | Redeemable Preferred Stock | Level 2 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Financial liability | 0 | 0 |
Fair Value Measurements, Recurring | Redeemable Preferred Stock | Level 3 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Financial liability | 3,165 | 5,247 |
Fair Value Measurements, Recurring | Redeemable Preferred Stock | Carrying Amount |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Financial liability | $ 3,165 | $ 5,247 |
3.25% convertible senior notes due 2023 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Debt instrument, interest rate | 3.25% | 3.25% | 3.25%
3.25% convertible senior notes due 2023 | Fair Value Measurements, Recurring | Level 1 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Financial liability | $ 0 | $ 0 |
3.25% convertible senior notes due 2023 | Fair Value Measurements, Recurring | Level 2 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Financial liability | 0 | 0 |
3.25% convertible senior notes due 2023 | Fair Value Measurements, Recurring | Level 3 |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Financial liability | 43,745 | 50,753 |
3.25% convertible senior notes due 2023 | Fair Value Measurements, Recurring | Carrying Amount |  |  |
Schedule Of Servicing Assets At Fair Value And Amortized Value [Line Items] |  |  |
Financial liability | $ 43,745 | $ 50,753 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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