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Revenue Recognition - Product Revenues, Classified by Geographic Location (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Concentration Risk [Line Items]
Revenues	$ 660	$ 969	$ 1,391	$ 1,560
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Americas [Member]
Concentration Risk [Line Items]
Revenues	$ 6	$ 55	$ 50	$ 203
Concentration risk percentage	1.00%	6.00%	4.00%	13.00%
Japan [Member]
Concentration Risk [Line Items]
Revenues	$ 581	$ 835	$ 1,159	$ 1,155
Concentration risk percentage	88.00%	86.00%	83.00%	74.00%
EMEA [Member]
Concentration Risk [Line Items]
Revenues	$ 57	$ 74	$ 148	$ 186
Concentration risk percentage	9.00%	8.00%	11.00%	12.00%
Asia Pacific [Member]
Concentration Risk [Line Items]
Revenues	$ 16	$ 5	$ 34	$ 16
Concentration risk percentage	2.00%	0.00%	2.00%	1.00%

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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