Quarterly report pursuant to Section 13 or 15(d)

Stock-based Compensation - Valuation Assumptions (Details)

v3.10.0.1
Stock-based Compensation - Valuation Assumptions (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividend yield 0.00% 0.00% 0.00% 0.00%
Volatility 106.00% 87.00% 104.00% 82.00%
Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate 2.75% 1.83% 2.70% 1.83%
Expected term (in years) 5 years 5 years 5 years 5 years
Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Risk-free interest rate 2.99% 1.94% 2.99% 2.29%
Expected term (in years) 6 years 6 years 10 years 9 years