Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Stock Option Activity (Details)

v3.19.2
Stock-Based Compensation - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Number of Shares    
Options granted (in shares) 311,800  
Options | Employees    
Number of Shares    
Outstanding, beginning balance (in shares) 2,306,256  
Options granted (in shares) 311,800  
Outstanding, ending balance (in shares) 2,618,056 2,306,256
Options vested and exercisable (in shares) 1,700,027  
Weighted Average Exercise Price per Share    
Outstanding, beginning balance (in dollars per shares) $ 2.36  
Options granted (in dollars per share) 9.89  
Outstanding, end balance (in dollars per shares) 3.26 $ 2.36
Options vested and exercisable (in dollars per shares) $ 1.26  
Options    
Intrinsic value, Outstanding, beginning balance $ 6,182  
Intrinsic value, granted 333  
Intrinsic value, Outstanding, end balance 20,174 $ 6,182
Intrinsic value, vested and exercisable $ 16,484,668  
Weighted average remaining contractual life, Outstanding, Beginning 8 years 6 months 8 years 9 months 18 days
Weighted average remaining contractual life, granted 9 years 10 months 24 days  
Weighted average remaining contractual life, vested and exercisable 8 years 2 months 12 days  
Options | Non-Employees    
Number of Shares    
Outstanding, beginning balance (in shares) 437,897  
Options exercised (in shares) (2,581)  
Outstanding, ending balance (in shares) 435,316 437,897
Options vested and exercisable (in shares) 186,431  
Weighted Average Exercise Price per Share    
Outstanding, beginning balance (in dollars per shares) $ 2.16  
Options exercised (in dollars per shares) 0.41  
Outstanding, end balance (in dollars per shares) 2.17 $ 2.16
Options vested and exercisable (in dollars per shares) $ 2.02  
Options    
Intrinsic value, Outstanding, beginning balance $ 1,229  
Intrinsic value, Outstanding, end balance 3,828 $ 1,229
Intrinsic value, vested and exercisable $ 1,666  
Weighted average remaining contractual life, Outstanding, Beginning 8 years 3 months 18 days 8 years 9 months 18 days
Weighted average remaining contractual life, vested and exercisable 8 years 3 months 18 days