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Convertible Notes - Summary of the carrying value of the convertible notes (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Instrument [Line Items] |  |  |
Carrying amount |  |  | $ 175,956
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  | $ 175,000 |
Plus: premium on Additional Notes |  | 250 |
Carrying amount |  | 175,250 |
Less: Unamortized debt discount and issuance costs | [1] | (9,431) |
Carrying amount |  | $ 165,819 |
Effective interest rate | [2] | 6.29% |
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Additional Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  | $ 25,000 |
Plus: premium on Additional Notes |  | 250 |
Carrying amount |  | 25,250 |
Less: Unamortized debt discount and issuance costs | [1] | (1,613) |
Carrying amount |  | $ 23,637 |
Effective interest rate | [2] | 6.37% |
Convertible Senior Notes Due Two Thousand And Twenty Three [Member] | Existing Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount |  | $ 150,000 |
Carrying amount |  | 150,000 |
Less: Unamortized debt discount and issuance costs | [1] | (7,818) |
Carrying amount |  | $ 142,182 |
Effective interest rate | [2] | 6.28% |
[1] | The debt discount arose from the bifurcation of the conversion option. The unamortized debt discount and issuance costs is reported net of the unamortized premium on the Additional Notes.
[2] | Includes amortization of the discount arising from the bifurcation of the conversion option, amortization of the issuance costs allocated to the Convertible Notes and amortization of the premium associated with the Additional Notes.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: 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)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: 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=120391452&loc=d3e13212-122682 + Details
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