Summary of Significant Accounting Policies - Schedule of Assumptions Used in Valuation of Redeemable Convertible Preferred Stock Warrants (Details) - Redeemable Convertible Preferred Stock Warrants - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Fair Value Measurements
Exercise price	$ 26.00	$ 26.00
Minimum
Fair Value Measurements
Expected volatility	42.40%	43.60%
Risk-free interest rate	1.22%	1.76%
Expected term (in years)	4 years	5 years
Maximum
Fair Value Measurements
Expected volatility	52.00%	52.90%
Risk-free interest rate	1.86%	2.27%
Expected term (in years)	9 years	10 years