Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Valuation Assumptions (Details)

v3.19.1
Stock-based Compensation - Valuation Assumptions (Details)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Dividend yield 0.00% 0.00%
Risk-free interest rate 2.45% 2.74%
Expected term (in years) 6 years 10 years
Volatility 103.00% 88.00%