Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plan - Schedule of Stock Option Activity (Detail)

v3.20.4
Stock Incentive Plan - Schedule of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares      
Beginning Balance 1,860,722    
Ending Balance 2,291,020 1,860,722  
Exercisable at end of period 1,229,770    
Weighted Average Exercise Price      
Ending Balance $ 3.23    
Weighted Average Remaining Contractual Term      
Contractual term 4 years 3 months 18 days    
Employee Stock Option [Member]      
Shares      
Beginning Balance 1,860,722 1,980,972  
Granted 743,000 88,750  
Exercised   (200)  
Forfeited or expired (312,702) (208,800)  
Ending Balance 2,291,020 1,860,722 1,980,972
Exercisable at end of period 1,229,770 1,248,844  
Expected to Vest 1,007,657 580,978  
Weighted Average Exercise Price      
Beginning Balance $ 4.39 $ 4.63  
Granted 1.37 1.63  
Exercised   2.38  
Forfeited or expired 5.71 5.77  
Ending Balance 3.23 4.39 $ 4.63
Exercisable at end of period 4.37 4.93  
Expected to Vest 3.26 4.40  
Weighted Average Grant Date Fair value      
Beginning Balance 2.37 2.61  
Granted 0.35 0.44  
Exercised   2.05  
Forfeited or expired 3.80 4.06  
Ending Balance 1.52 2.37 $ 2.61
Exercisable at end of period 2.22 2.78  
Expected to Vest $ 1.54 $ 2.38  
Weighted Average Remaining Contractual Term      
Contractual term 4 years 3 months 18 days 3 years 7 months 6 days 4 years 1 month 6 days
Exercisable at end of period 2 years 4 months 24 days 2 years 3 months 18 days  
Expected to Vest 4 years 2 months 12 days 3 years 6 months  
Aggregate Intrinsic Value      
Forfeited or expired   $ 2