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Revenue Recognition - Product Revenues, Classified by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Concentration Risk [Line Items]
Revenues	$ 858	$ 467	$ 2,249	$ 2,027
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Americas [Member]
Concentration Risk [Line Items]
Revenues	$ 199	$ 112	$ 249	$ 315
Concentration risk percentage	23.00%	24.00%	11.00%	15.00%
Japan [Member]
Concentration Risk [Line Items]
Revenues	$ 535	$ 279	$ 1,693	$ 1,434
Concentration risk percentage	62.00%	60.00%	75.00%	71.00%
EMEA [Member]
Concentration Risk [Line Items]
Revenues	$ 114	$ 18	$ 262	$ 204
Concentration risk percentage	14.00%	4.00%	12.00%	10.00%
Asia Pacific [Member]
Concentration Risk [Line Items]
Revenues	$ 10	$ 58	$ 45	$ 74
Concentration risk percentage	1.00%	12.00%	2.00%	4.00%

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