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Leases - Schedule of Components of Lease expense (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Assets |  |  |  |
Prepaid expenses and other current assets | $ 3,972 | $ 3,908 |  |
Operating lease right-of-use assets | $ 30,561 | $ 27,803 | $ 16,945 | $ 0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesCurrent | us-gaap:OtherLiabilitiesCurrent |  |
Liabilities [Abstract] |  |  |  |
Other current liabilities | $ 1,845 | $ 2,826 |  |
Operating lease liabilities | 40,146 | 33,312 |  |
Total lease liabilities | $ 41,991 | $ 36,138 | $ 20,056 | $ 0
Weighted-average remaining lease term (years) | 10 years 9 months 18 days | 10 years 7 months 6 days |  |
Weighted-average discount rate | 4.50% | 4.70% |  |

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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