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Convertible Notes, Debts and Finance Leases - Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Convertible Note due 2022 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Contractual interest expense | $ 953 |  |
Amortization of Debt Discount | 373 |  |
Amortization of debt issuance costs | 117 |  |
Total interest expense recognized | 1,443 |  |
Convertible Note due 2024 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Contractual interest expense | 2,310 | $ 687 |
Amortization of Debt Discount | 4,358 | 1,226 |
Amortization of debt issuance costs | 595 | 166 |
Total interest expense recognized | 7,263 | 2,079 |
Convertible Note due 2020 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Contractual interest expense | 936 | 4,148 | $ 5,130
Amortization of Debt Discount | 1,158 | 4,787 | 5,408
Amortization of debt issuance costs | 138 | 577 | 652
Total interest expense recognized | $ 2,232 | $ 9,512 | $ 11,190

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition Amount of amortization expense attributable to debt issuance costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(8)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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