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Commitments and Contingencies - Leases (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating leases rental expenses, after adoption of Topic 842 |  |  |
Lease costs | $ 2,612 |  |
Less: income from subleases | 0 |  |
Net lease costs | 2,612 |  |
Operating leases rental expenses, before adoption of Topic 842 |  |  |
Lease costs |  | $ 2,829 | $ 2,614
Less: income from subleases |  | (347) | (418)
Net lease costs |  | $ 2,482 | $ 2,196
Future lease obligations under our operating leases |  |  |
2020 | 1,792 |  |
2021 | 970 |  |
2022 | 749 |  |
2023 | 367 |  |
2024 | 223 |  |
Thereafter | 9 |  |
Total lease payments | 4,110 |  |
Less: imputed interest | (194) |  |
Operating lease liability | $ 3,916 |  |

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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