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Convertible Senior Notes - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 24, 2016 USD ($) D $ / shares | Dec. 31, 2018 USD ($) D | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from issuance of convertible senior notes, net of costs |  |  |  |  | $ 111,070,000
Accretion of the debt discount |  |  | $ 4,248,000 | $ 3,977,000 | $ 2,274,000
2.125% Convertible Senior Notes due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes issued | $ 115,000,000 |  |  | 11,000 |
Notes, interest rate | 2.125% | 2.125% | 2.125% |  |
Proceeds from issuance of convertible senior notes, net of costs | $ 111,100,000 |  |  |  |
Notes, frequency of periodic payment |  |  | Semi-annually |  |
Notes, date of first required payment |  |  | Dec. 01, 2016 |  |
Notes, due date |  |  | Jun. 01, 2021 |  |
Loss on conversion of senior convertible notes |  |  | $ (1,000) |  |
Notes threshold percentage of stock price trigger |  | 130.00% |  |  |
Notes threshold trading days | D |  | 20 |  |  |
Notes threshold consecutive trading days | D |  | 30 |  |  |
Debt instrument, convertible if-converted value in excess of principal |  |  | 69,600,000 |  |
Notes conversion ratio per $1,000 principal amount | 31.1813 |  |  |  |
Notes initial conversion price | $ / shares | $ 32.07 |  |  |  |
Debt covenants debt default holder percent to declare all notes due minimum | 25.00% |  |  |  |
Number of days within which entity fails to satisfy obligations considered as event of default | 270 days |  |  |  |
Notes issued, fair value | $ 96,300 |  |  |  |
Contractual coupon interest |  |  | 2,400 | 2,400 |
Accretion of the debt discount |  |  | 3,600 | 3,400 |
Amortization of the debt issuance costs |  |  | $ 600 | 600 |
Effective interest rate on the Notes |  | 6.60% | 6.60% |  |
Notes, carrying value |  | $ 103,488,000 | $ 103,488,000 | $ 99,250,000 |
Fair value of the note |  | $ 184,600,000 | $ 184,600,000 |  |
2.125% Convertible Senior Notes due 2021 | On any business day on or after June 5, 2019 and prior to the maturity date |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes threshold percentage of stock price trigger | 130.00% |  |  |  |
Notes threshold trading days | D | 20 |  |  |  |
Notes threshold consecutive trading days | D | 30 |  |  |  |
Notes redemption price | 100.00% |  |  |  |

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