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Summary of Significant Accounting Policies - Product Revenues, Classified by Geographic Location (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Concentration Risk [Line Items]
Revenues	$ 3,671	$ 2,689
Product [Member]
Concentration Risk [Line Items]
Revenues	$ 2,671	$ 2,689
Concentration risk percentage	100.00%	100.00%
Americas [Member]
Concentration Risk [Line Items]
Revenues	$ 293	$ 345
Concentration risk percentage	11.00%	13.00%
Japan [Member]
Concentration Risk [Line Items]
Revenues	$ 2,058	$ 1,924
Concentration risk percentage	77.00%	71.00%
EMEA [Member]
Concentration Risk [Line Items]
Revenues	$ 270	$ 344
Concentration risk percentage	10.00%	13.00%
Asia Pacific [Member]
Concentration Risk [Line Items]
Revenues	$ 50	$ 76
Concentration risk percentage	2.00%	3.00%

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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