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Commitments and Contingencies (Future Minimum Sublease Rental Income) (Details) | Dec. 31, 2018 USD ($)
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Sublease Rentals [Line Items] |
2019 | $ 8,022
2020 | 4,003
2021 | 1,585
2022 | 1,264
2023 | 1,126
Thereafter | 1,042
Rental income | $ 17,042

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