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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%

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