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Unsecured Convertible Senior Notes - Unsecured convertible senior notes outstanding (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Aug. 14, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |
Principal amount | $ 320,030 |  |
Unamortized discount | (77,645) |  |
Unamortized issuance costs attributable to principal amount | (6,097) |  |
Total Convertible Senior Notes, net | 236,288 |  |
2023 Convertible Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 95,000 | $ 95,000 | $ 210,000
Unamortized discount | (17,101) |  | (47,660)
Unamortized issuance costs attributable to principal amount | (1,481) |  | (4,127)
Total Convertible Senior Notes, net | 76,418 |  | 158,213
Fair value of outstanding Convertible Senior Notes (2) | 101,769 |  | 208,163
Amount by which the Convertible Senior Notes if-converted value exceeds their principal amount | 6,769 |  |
Equity component | 25,854 |  | 57,152
Issuance costs | (837) |  | (1,851)
Net carrying amount of equity component (1) | 25,017 |  | $ 55,301
2026 Convertible Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 225,030 |  |
Unamortized discount | (60,544) |  |
Unamortized issuance costs attributable to principal amount | (4,616) |  |
Total Convertible Senior Notes, net | 159,870 |  |
Fair value of outstanding Convertible Senior Notes (2) | 246,779 |  |
Amount by which the Convertible Senior Notes if-converted value exceeds their principal amount | 21,749 |  |
Equity component | 63,544 |  |
Issuance costs | (1,916) |  |
Net carrying amount of equity component (1) | $ 61,628 |  |

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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 The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031898-161870 + Details
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