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Leases - Narrative (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2021 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) lease | Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items] |  |  |  |
Rent expense |  |  |  | $ 4,900
Impairment of ROU asset |  | $ 800 |  |
Number of operating leases not yet commenced | lease |  |  | 4 |
Initial lease liability of operating leases that have not yet commenced |  |  | $ 400 |
Operating lease right-of-use assets |  | $ 19,826 | $ 19,522 |
Prepaid lease assets, remaining amortization period |  | 4 years 3 months 18 days | 3 years 8 months 12 days |
Net book value of asset |  | $ 90,732 | $ 87,285 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] |  | us-gaap:OtherAccruedLiabilitiesCurrent | us-gaap:OtherAccruedLiabilitiesCurrent |
Subsequent event |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lease liability reversal | $ 700 |  |  |
Three-year term |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Term of operating lease that has not yet commenced |  |  | 2 years |
Four-year term |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Term of operating lease that has not yet commenced |  |  | 4 years |
Yangzhou |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease right-of-use assets |  |  | $ 2,400 |
Prepaid lease assets, remaining amortization period |  |  | 38 years |
Yangzhou | Buildings on prepaid land |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Net book value of asset |  |  | $ 16,900 |
Remaining depreciable period of asset |  |  | 19 years |
Property subject to rent escalations | Maximum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lessee term of contract |  |  | 40 years |

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