Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
Stock Incentive Plan - Schedule of Stock Option Activity (Detail) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Shares    
Beginning Balance 2,291,020  
Granted 210,000  
Exercised (185,782)  
Forfeited or expired (151,946)  
Ending Balance 2,163,292 2,291,020
Exercisable at end of period 1,086,417  
Expected to Vest 1,022,493  
Weighted Average Exercise Price    
Beginning Balance $ 3.23  
Granted 2.01  
Exercised 2.11  
Forfeited or expired 6.77  
Ending Balance 2.96 $ 3.23
Exercisable at end of period 3.92  
Expected to Vest 2.98  
Weighted Average Grant Date Fair value    
Beginning Balance 1.52  
Granted 1.44  
Exercised 0.97  
Forfeited or expired 4.82  
Ending Balance 1.33 $ 1.52
Exercisable at end of period 1.76  
Expected to Vest $ 1.34  
Weighted Average Remaining Contractual Term    
Contractual term 4 years 9 months 18 days 4 years 3 months 18 days
Exercisable at end of period 2 years 9 months 18 days  
Expected to Vest 4 years 8 months 12 days  
Aggregate Intrinsic Value    
Exercised $ 188  
Ending Balance 1,360  
Exercisable at end of period 248  
Expected to Vest $ 1,056