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Business Segments, Concentration of Credit Risk and Significant Customers - Significant Customers (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017 USD ($) customer	Sep. 30, 2016	Sep. 30, 2017 USD ($) customer	Sep. 30, 2016	Dec. 31, 2016 USD ($) customer	Dec. 31, 2015 USD ($) customer	Dec. 31, 2014
Significant Customers
Property and equipment, net	$ 748		$ 748		$ 1,274	$ 1,630
Customer A
Significant Customers
Percentage of concentration risk	43.00%		44.00%
Customer B
Significant Customers
Percentage of concentration risk	24.00%	41.00%	15.00%	47.00%
Customer C
Significant Customers
Percentage of concentration risk	15.00%	25.00%	15.00%	23.00%
Customer D
Significant Customers
Percentage of concentration risk		13.00%		12.00%
Total revenues | Customer concentration risk | Customer A
Significant Customers
Percentage of concentration risk					47.00%	34.00%
Total revenues | Customer concentration risk | Customer B
Significant Customers
Percentage of concentration risk					21.00%	12.00%	31.00%
Total revenues | Customer concentration risk | Customer C
Significant Customers
Percentage of concentration risk					13.00%	31.00%	34.00%
Total revenues | Customer concentration risk | Customer D
Significant Customers
Percentage of concentration risk							11.00%
Net accounts receivable | Credit concentration | Three customers
Significant Customers
Percentage of concentration risk						94.00%
Number of customers | customer						3
Net accounts receivable | Credit concentration | One customer
Significant Customers
Percentage of concentration risk			78.00%		72.00%
Number of customers | customer	3		3		1
United States
Significant Customers
Property and equipment, net					$ 1,274	$ 1,578
Non-U.S.
Significant Customers
Property and equipment, net						$ 52

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- Definition

Represents the number of customers on whom the entity relies significantly giving rise to concentration of risk.

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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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- Definition

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.

+ References

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-Publisher FASB
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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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