Description of Operations and Summary of Significant Accounting Policies - Property and Equipment Estimated Useful Lives (Details)	12 Months Ended
	Dec. 31, 2016
Furniture
Property Plant And Equipment [Line Items]
Property and equipment estimated useful lives	3 years
Minimum | Computer and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment estimated useful lives	2 years
Minimum | Software
Property Plant And Equipment [Line Items]
Property and equipment estimated useful lives	1 year
Maximum | Computer and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment estimated useful lives	3 years
Maximum | Software
Property Plant And Equipment [Line Items]
Property and equipment estimated useful lives	3 years