Concentration of credit risk (Tables)

6 Months Ended

Jun. 30, 2017

Accounts Receivable

Concentration of credit risk

Schedule of concentrations of 10% and greater

	As of		As of
	June 30,		December 31,
	2017		2016
Customer A	20	%	22	%
Customer B	17		17

Revenue

Concentration of credit risk

Schedule of concentrations of 10% and greater

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Customer A	19	%	15	%	19	%	16	%
Customer C	*		*		*		10
Customer G	*		12		*		11

* Less than 10% revenue concentration.