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Leases - Schedule of Operating Lease Right-of-use Assets and Liabilities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Leases [Abstract] |  |  |  |
Operating lease right-of-use assets | $ 2,101 |  |  |
Amortization of operating lease right-of-use assets | (161) | (217) | (291) |
Addition of operating lease right-of -use asset | 28 |  |  |
Write-off of right-of-use asset due to headquarters lease termination | (1,913) |  |  |
Write-off of right-of-use asset related to other lease terminations | (50) |  |  |
Operating lease right-of-use assets | 5 |  | 2,101 |
Operating lease liabilities, Beginning | 3,300 | $ 3,458 | 3,458 |
Principal payments on operating lease liabilities | (154) |  |  |
Addition of operating lease liability | 28 |  |  |
Write-off of lease liability related to headquarters lease termination | (3,135) |  |  |
Write-off of lease liability related to other lease terminations | (34) |  |  |
Operating lease liabilities, Ending | 5 |  | 3,300 | 3,458
Less non-current portion |  |  | (2,891) |
Current portion | $ 5 |  | $ 409 |

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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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