Annual report pursuant to Section 13 and 15(d)

Equity Incentive Plans, Employee Stock Purchase Plan and Stock-Based Compensation - Schedule of Fair Value of ESPP shares Using Option Pricing Model (Details)

v3.19.1
Equity Incentive Plans, Employee Stock Purchase Plan and Stock-Based Compensation - Schedule of Fair Value of ESPP shares Using Option Pricing Model (Details) - ESPP
12 Months Ended
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions And Methodology [Line Items]  
Expected term (in years) 6 months
Expected volatility 55.28%
Risk-free interest rate 2.37%