Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2017 customer country	Dec. 31, 2016 customer
Number of countries in which Company maintains offices (in country) | country	6
Summary of Significant Accounting Policies (Textual) [Abstract]
Number of Customers | customer	1	1
Avnet
Percentage of accounts receivable	0.00%	26.90%