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Commitments and Contingencies - Leases (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
2018 (6 months) | $ 1,456 |  | $ 1,456 |
2019 | 3,604 |  | 3,604 |
2020 | 4,088 |  | 4,088 |
2021 | 4,152 |  | 4,152 |
2022 | 879 |  | 879 |
Thereafter | 352 |  | 352 |
Total minimum rental income | 14,531 |  | 14,531 |
Operating Leases, Rent Expense, Sublease Rentals | $ 600 | $ 500 | $ 900 | $ 1,000

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- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
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