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Convertible Senior Notes - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 24, 2016 USD ($) d $ / shares | Dec. 31, 2017 USD ($) d | Sep. 30, 2017 d | Dec. 31, 2017 USD ($) | 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 |  |  |  | $ 3,977,000 | 2,274,000
2.125% Convertible Senior Notes due 2021 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Notes issued | $ 115,000,000 | $ 11,000 |  | $ 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 |
Notes threshold percentage of stock price trigger |  |  | 130.00% |  |
Notes maximum threshold percentage |  | 130.00% |  |  |
Notes threshold trading days | d |  | 20 | 20 |  |
Notes threshold consecutive trading days | d |  | 30 | 30 |  |
Debt instrument, convertible if-converted value in excess of principal |  |  |  | $ 34,500,000 |
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 |  |  |  | 2,444,000 | 1,473,000
Accretion of the debt discount |  |  |  | 3,382,000 | 1,934,000
Amortization of the debt issuance costs |  |  |  | $ 595,000 | 340,000
Effective interest rate on the Notes |  | 6.60% |  | 6.60% |
Notes, carrying value |  | $ 99,250,000 |  | $ 99,250,000 | $ 95,272,000
Fair value of the note |  | $ 149,500,000 |  | $ 149,500,000 |
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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- Definition Debt instrument debt covenants debt default holder percent to declare all notes due minimum. + References No definition available. + Details
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- Definition Debt instrument number of days within which entity fails to satisfy obligations considered as event of default. + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + Details
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