Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Stock Incentive Plan - Schedule of Stock Option Activity (Detail) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Shares      
Beginning Balance 2,291,020 2,291,020  
Granted   270,000  
Exercised   (192,507)  
Forfeited or expired   (157,446)  
Ending Balance   2,211,067 2,291,020
Exercisable at end of period   1,209,942  
Expected to Vest   950,568  
Weighted Average Exercise Price      
Beginning Balance $ 3.23 $ 3.23  
Granted   2.14  
Exercised   2.11  
Forfeited or expired   6.73  
Ending Balance   2.95 $ 3.23
Exercisable at end of period   3.84  
Expected to Vest   2.97  
Weighted Average Grant Date Fair value      
Beginning Balance $ 1.52 1.52  
Granted   1.55  
Exercised   0.97  
Forfeited or expired   4.74  
Ending Balance   1.34 $ 1.52
Exercisable at end of period   1.75  
Expected to Vest   $ 1.35  
Weighted Average Remaining Contractual Term      
Contractual term   4 years 4 months 24 days 4 years 3 months 18 days
Exercisable at end of period   2 years 7 months 6 days  
Expected to Vest   4 years 3 months 18 days  
Aggregate Intrinsic Value      
Exercised $ 200    
Ending Balance 2,484    
Exercisable at end of period 640    
Expected to Vest $ 2,391