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Summary of Significant Accounting Policies - Bad debts and Concentration of Credit Risk (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) item
Allowance for bad debt and credit activity |  |
Beginning balance | $ 395 | $ 211
Bad debt expense (benefit) | (89) | 228
Write-off of uncollectible accounts | (2) | (37)
Currency translation adjustment | (15) | (7)
Ending balance | $ 289 | $ 395
Customer Concentration Risk | Net sales |  |
Allowance for bad debt and credit activity |  |
Number of customers | item | 2 | 1
Customer Concentration Risk | Net sales | Major Customer Number One |  |
Allowance for bad debt and credit activity |  |
Concentration risk (as a percent) | 15.00% | 18.00%
Customer Concentration Risk | Net sales | Major Customer Number Two |  |
Allowance for bad debt and credit activity |  |
Concentration risk (as a percent) | 14.00% |

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- Definition Amount of allowance for credit loss on accounts receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 + Details
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