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Revenue Recognition - Product Revenues, Classified by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Concentration Risk [Line Items]
Revenues	$ 703	$ 731
Product [Member]
Concentration Risk [Line Items]
Revenues	$ 703	$ 731
Concentration risk percentage	100.00%	100.00%
Americas [Member]
Concentration Risk [Line Items]
Revenues	$ 64	$ 45
Concentration risk percentage	9.00%	6.00%
Japan [Member]
Concentration Risk [Line Items]
Revenues	$ 419	$ 578
Concentration risk percentage	60.00%	79.00%
EMEA [Member]
Concentration Risk [Line Items]
Revenues	$ 150	$ 90
Concentration risk percentage	21.00%	12.00%
Asia Pacific [Member]
Concentration Risk [Line Items]
Revenues	$ 70	$ 18
Concentration risk percentage	10.00%	3.00%

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- Definition

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.

+ References

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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