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Business Segments, Concentration of Credit Risk and Significant Customers - Significant Customers (Details) - customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Customer A
Significant Customers
Percentage of concentration risk	35.00%		44.00%
Customer B
Significant Customers
Percentage of concentration risk	14.00%	19.00%	14.00%	22.00%
Customer C
Significant Customers
Percentage of concentration risk	11.00%	54.00%		50.00%
Customer D
Significant Customers
Percentage of concentration risk	10.00%		12.00%	11.00%
Net accounts receivable | Credit concentration | One customer
Significant Customers
Percentage of concentration risk			67.00%		72.00%
Number of customers	3		3		1

X

- Definition

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

+ References

No definition available.

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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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- 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592

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-Name Accounting Standards Codification
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