Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Stock Incentive Plan - Schedule of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Shares    
Ending Balance 1,830,222 1,443,087
Employee Stock Option [Member]    
Shares    
Beginning Balance 1,980,972  
Granted 5,000  
Exercised 0  
Forfeited or expired (155,750)  
Ending Balance 1,830,222  
Exercisable at end of period 1,112,844  
Expected to Vest 681,150  
Weighted Average Exercise Price    
Beginning Balance $ 4.63  
Granted 2.82  
Exercised 0  
Forfeited or expired 6.43  
Ending Balance 4.49  
Exercisable at end of period 5.13  
Expected to Vest 4.51  
Weighted Average Grant Date Fair value    
Beginning Balance 2.61  
Granted 1.43  
Exercised 0  
Forfeited or expired 4.53  
Ending Balance 2.46  
Exercisable at end of period 2.89  
Expected to Vest $ 2.47  
Weighted Average Remaining Contractual Term    
Contractual term 4 years 1 month 6 days  
Contractual term 4 years 1 month 6 days  
Exercisable at end of period 2 years 8 months 12 days  
Expected to Vest 4 years 1 month 6 days  
Aggregate Intrinsic Value    
Exercised $ 0  
Forfeited or expired 2  
Ending Balance 10  
Exercisable at end of period 10  
Expected to Vest $ 10