Geographic Information (Narrative) (Details) - segment	3 Months Ended		6 Months Ended			12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2016
Segment Reporting Information [Line Items]
Number of business segments			1		2
Revenue [Member]
Segment Reporting Information [Line Items]
Concentration percentage	100.00%	100.00%	100.00%	100.00%
Major Customer, One [Member] | Revenue [Member]
Segment Reporting Information [Line Items]
Concentration percentage	23.00%	11.00%	20.00%	14.00%
Major Customer, One [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration percentage			30.00%			11.00%
Major Customer, Two [Member] | Revenue [Member]
Segment Reporting Information [Line Items]
Concentration percentage	9.00%	14.00%	11.00%	14.00%
Major Customer, Two [Member] | Accounts Receivable [Member]
Segment Reporting Information [Line Items]
Concentration percentage			11.00%			11.00%
Australia [Member] | Revenue [Member]
Segment Reporting Information [Line Items]
Concentration percentage	25.00%	12.00%	21.00%	17.00%