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Convertible Senior Notes - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 24, 2016 USD ($) d $ / shares | Sep. 30, 2018 USD ($) d | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Loss on conversion of senior convertible notes |  |  | $ (1,000) |  |
Accretion of the debt discount |  |  | $ 3,160,000 | $ 2,958,000 |
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 |  | $ 87,400,000 |  |  |
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 | $ 96,289,000 |  |  |  |
Contractual coupon interest |  | 611,000 | 1,833,000 |  |
Accretion of the debt discount |  | 911,000 | 2,687,000 |  |
Amortization of the debt issuance costs |  | $ 160,000 | $ 473,000 |  |
Effective interest rate on the Notes |  | 6.60% | 6.60% |  |
Notes, carrying value |  | $ 102,400,000 | $ 102,400,000 |  | $ 99,250,000
Fair value of the note |  | $ 202,400,000 | $ 202,400,000 |  |
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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