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Commitments and Contingencies - Concentrations of Credit Risk (Details) - item	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounts receivable. | Credit risk
Customer Concentration
Concentration Risk Number of Customers	3		2
Concentration risk (as a percent)	50.80%		50.90%
Accounts receivable. | Credit risk | Customer one
Customer Concentration
Concentration risk (as a percent)	20.60%		38.50%
Accounts receivable. | Credit risk | Customer two
Customer Concentration
Concentration risk (as a percent)	17.80%		12.40%
Accounts receivable. | Credit risk | Customer three
Customer Concentration
Concentration risk (as a percent)	12.40%
Revenues. | Customer concentration
Customer Concentration
Number of customers in addition to Walmart	1	2
Concentration risk (as a percent)	49.40%	95.10%
Revenues. | Customer concentration | Customer two
Customer Concentration
Concentration risk (as a percent)	10.80%	16.10%
Revenues. | Customer concentration | Customer three
Customer Concentration
Concentration risk (as a percent)		10.20%
Revenues. | Customer concentration | Walmart
Customer Concentration
Concentration risk (as a percent)	38.60%	68.80%

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- Definition

Represents the number customers, in addition to any customers mentioned by name, of the entity which have concentration risk as of the balance sheet date.

+ References

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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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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=51801978&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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