Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2016
Computer and software | Minimum
Property, Plant and Equipment [Line Items]
Property, and equipment useful life	3 years
Computer and software | Maximum
Property, Plant and Equipment [Line Items]
Property, and equipment useful life	5 years
Furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Property, and equipment useful life	5 years
Furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Property, and equipment useful life	7 years