XML 59 R42.htm IDEA: XBRL DOCUMENT v3.24.1
Stock-based Compensation - Company's Stock Option Activity (Details) - 2013 Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
OUTSTANDING OPTIONS        
Outstanding at beginning of period 6,774,792      
Options granted 2,496,850      
Options exercised (100,960) 0 0 0
Options forfeited (896,882)      
Outstanding at end of period 8,273,800 6,774,792    
WEIGHTED-AVERAGE EXERCISE PRICE        
Outstanding at beginning of period $ 6.37      
Options granted 2.52      
Options exercised 1.15      
Options forfeited 6.16      
Outstanding at end of period $ 5.29 $ 6.37    
VESTED AND EXPECTED TO VEST        
Outstanding options 8,131,900      
Weighted-Average Exercise Price $ 5.37      
Weighted-Average Remaining Contractual Term 6 years 3 months 18 days      
Aggregate Intrinsic Value (in thousands) $ 1,865      
ADDITIONAL DISCLOSURES        
Outstanding options exercisable at end of period 4,993,061      
Weighted-average exercise price exercisable at end of period $ 7.30      
Weighted-average contractual term outstanding 6 years 3 months 18 days 6 years 1 month 6 days    
Weighted-average contractual term (years) exercisable 4 years 6 months      
Aggregate intrinsic value (in thousands) outstanding at end of period $ 2,043      
Aggregate intrinsic value (in thousands) exercisable at end of period $ 921