Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
Stock Incentive Plan - Schedule of Stock Option Activity (Detail) - Employee Stock Option [Member] - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Shares    
Beginning Balance 1,860,722  
Granted 743,000  
Forfeited or expired (212,925)  
Ending Balance 2,390,797 1,860,722
Exercisable at end of period 1,140,047  
Expected to Vest 1,187,587  
Weighted Average Exercise Price    
Beginning Balance $ 4.63  
Granted 1.37  
Forfeited or expired 6.43  
Ending Balance 3.27 $ 4.63
Exercisable at end of period 4.62  
Expected to Vest 3.30  
Weighted Average Grant Date Fair value    
Beginning Balance 2.61  
Granted 0.35  
Forfeited or expired 4.35  
Ending Balance 1.56 $ 2.61
Exercisable at end of period 2.37  
Expected to Vest $ 1.58  
Weighted Average Remaining Contractual Term    
Contractual term 4 years 10 months 24 days 4 years 1 month 6 days
Exercisable at end of period 2 years 8 months 12 days  
Expected to Vest 4 years 10 months 24 days  
Aggregate Intrinsic Value    
Forfeited or expired