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Leases - Summary of Operating and Financing Leases (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Lease cost |  |
Operating lease cost | $ 451 |
Sublease income | (132) |
Total | 319 |
Other information |  |
Operating cash flows out from operating leases | (451) |
Operating cash flows in from operating leases | 132 |
Right of use assets obtained in exchange for lease obligations | 192 | $ 729
U.S. [Member] |  |
Lease cost |  |
Operating lease cost | 315 |
Total | 315 |
Other information |  |
Operating cash flows out from operating leases | $ (315) |
Weighted average remaining lease term | 1 year 3 months 18 days |
Weighted average discount rate - operating leases | 8.00% |
Ireland [Member] |  |
Lease cost |  |
Operating lease cost | $ 136 |
Sublease income | (132) |
Total | 4 |
Other information |  |
Operating cash flows out from operating leases | (136) |
Operating cash flows in from operating leases | 132 |
Right of use assets obtained in exchange for lease obligations | $ 192 |
Weighted average remaining lease term | 4 years 9 months 18 days |
Weighted average discount rate - operating leases | 8.00% |

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- Definition Amount of lease cost recognized by lessee for lease contract. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=123414884&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918686-209980 + Details
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