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Summary of Significant Accounting Policies - Bad debts and Concentration of Credit Risk (Details)
$ in Thousands
12 Months Ended
Dec. 20, 2017
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Allowance for bad debt and credit activity      
Beginning balance   $ 48 $ 124
Bad debt expense   169 4
Write-off of uncollectible accounts   (6) (82)
Currency translation adjustment     2
Ending balance   $ 211 $ 48
Reverse stock split 0.20    
Customer Concentration Risk | Net sales      
Allowance for bad debt and credit activity      
Concentration risk (as a percent)   19.00% 15.00%