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Preferred and Common Stock Warrants (Tables)
12 Months Ended
Dec. 31, 2018
Redeemable Convertible Preferred Stock Warrants  
Assumptions Used to Calculate Fair Value of Outstanding Warrants
The following assumptions were used to calculate the estimated fair value of the then-outstanding warrants until the closing date of the Company’s IPO and as of December 31, 2017 and 2016:
 
 
2017
 
2016
Dividend yield
 
0
%
 
0
%
Expected term (in years)
 
2.75

 
0.50 - 3.75

Risk-free interest rates
 
1.8
%
 
1.0% - 1.6%

Expected volatility
 
34.6
%
 
34.8% - 39.2%