Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Stock Incentive Plan - Schedule of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Dec. 31, 2018
Shares      
Ending Balance 1,989,472 1,834,472  
Employee Stock Option [Member]      
Shares      
Beginning Balance   1,980,972  
Granted   38,750  
Exercised   (200)  
Forfeited or expired   (185,050)  
Ending Balance   1,834,472 1,980,972
Exercisable at end of period   1,264,344  
Expected to Vest   541,337  
Weighted Average Exercise Price      
Beginning Balance   $ 4.63  
Granted   1.80  
Exercised   2.38  
Forfeited or expired   5.81  
Ending Balance   4.47 $ 4.63
Exercisable at end of period   4.93  
Expected to Vest   4.49  
Weighted Average Grant Date Fair value      
Beginning Balance   2.61  
Granted   0.30  
Exercised   2.05  
Forfeited or expired   4.14  
Ending Balance   2.42 $ 2.61
Exercisable at end of period   2.79  
Expected to Vest   $ 2.43  
Weighted Average Remaining Contractual Term      
Contractual term   3 years 9 months 18 days 4 years 1 month 6 days
Exercisable at end of period   2 years 6 months  
Expected to Vest   3 years 8 months 12 days  
Aggregate Intrinsic Value      
Granted   $ 0  
Exercised   0  
Forfeited or expired   $ 2