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Leases (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Leases (Details) [Line Items] |  |  |  |
Operating lease, description |  |  | One of our primary operating leases includes options to extend the lease for one to three years and the other primary lease includes an option to annually extend; those operating leases also include options to terminate the leases within one year. |
Extended, description |  |  | Our Stockholm corporate office lease has a remaining lease term of 17 months and both of our leases are automatically renewed at a cost increase of 2% on an annual basis, unless we provide written notice nine months prior to the respective expiration dates. |
Short term lease costs | $ 38,000 | $ 27,000 | $ 76,000 | $ 51,000
Minimum [Member] |  |  |  |
Leases (Details) [Line Items] |  |  |  |
Lease term | 3 months |  | 3 months |
Maximum [Member] |  |  |  |
Leases (Details) [Line Items] |  |  |  |
Lease term | 18 months |  | 18 months |

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- Definition Description of terms and conditions of option to extend lessor's operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
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- Definition Term of lessor's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
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- Definition Amount of short-term lease cost, excluding expense for lease with term of one month or less. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -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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