Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Schedule of Fair Value Measurement Assumptions (Details)

v3.19.1
Stock-Based Compensation - Schedule of Fair Value Measurement Assumptions (Details)
Apr. 19, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Risk-free interest rate, minimum 2.77%
Risk-free interest rate, maximum 2.82%
Expected dividend yield 0.00%
Expected volatility, minimum 97.40%
Expected volatility, maximum 98.80%
Minimum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected term 5 years 4 months 24 days
Maximum [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Expected term 5 years 6 months