Significant Customer and Geographic Information - Concentration Risk (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Customer Concentration Risk [Member] | Customer A [Member] | Sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	27.00%	76.00%	37.00%	43.00%
Customer Concentration Risk [Member] | Customer B [Member] | Sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage				27.00%
Customer Concentration Risk [Member] | Customer C [Member] | Sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	29.00%		18.00%
Customer Concentration Risk [Member] | Customer D [Member] | Sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	11.00%		11.00%
Customer Concentration Risk [Member] | Customer E [Member] | Sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%
Customer Concentration Risk [Member] | Customer F [Member] | Sales [Member]
Concentration Risk [Line Items]
Concentration risk, percentage		11.00%
Credit Concentration Risk [Member] | Customer A [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			30.00%		54.00%
Credit Concentration Risk [Member] | Customer C [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			35.00%
Credit Concentration Risk [Member] | Customer E [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, percentage			13.00%
Credit Concentration Risk [Member] | Customer F [Member] | Accounts Receivable [Member]
Concentration Risk [Line Items]
Concentration risk, percentage					16.00%