Stockholder's Deficit - Summary of Assumptions Used to Value Preferred Stock Warrants (Details) - Preferred Stock Warrants	3 Months Ended
	Mar. 31, 2017
Minimum
Class Of Warrant Or Right [Line Items]
Expected term (in years)	3 years 2 months 12 days
Risk-free interest rate	1.50%
Expected volatility	45.30%
Maximum
Class Of Warrant Or Right [Line Items]
Expected term (in years)	3 years 4 months 24 days
Risk-free interest rate	1.60%
Expected volatility	45.90%