Annual report pursuant to Section 13 and 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
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Shares    
Beginning Balance 1,428,462  
Granted   0
Ending Balance 1,980,972 1,428,462
Exercisable at end of period 1,055,716  
Weighted Average Exercise Price    
Ending Balance $ 4.63  
Weighted Average Remaining Contractual Term    
Contractual term 4 years 1 month 6 days  
Weighted Average Contractual Life Remaining 4 years 1 month 6 days  
Employee Stock Option [Member]    
Shares    
Beginning Balance 1,428,462 1,720,000
Granted 650,000  
Exercised (17,615) (127,663)
Forfeited or expired (79,875) (163,875)
Ending Balance 1,980,972 1,428,462
Exercisable at end of period 1,055,716 934,959
Expected to Vest 878,531 468,581
Weighted Average Exercise Price    
Beginning Balance $ 5.20 $ 5.12
Granted 3.30  
Exercised 2.49 4.02
Forfeited or expired 4.42 5.75
Ending Balance 4.63 5.20
Exercisable at end of period 5.51 5.66
Expected to Vest 4.65 5.21
Weighted Average Grant Date Fair value    
Beginning Balance 2.96 2.89
Granted 1.86  
Exercised 2.11 2.03
Forfeited or expired 3.20 2.99
Ending Balance 2.61 2.96
Exercisable at end of period 3.38 3.77
Expected to Vest $ 2.63 $ 2.98
Weighted Average Remaining Contractual Term    
Contractual term 4 years 1 month 6 days 3 years 8 months 12 days
Exercisable at end of period 2 years 2 months 12 days 2 years 8 months 12 days
Expected to Vest 4 years 3 years 8 months 12 days
Weighted Average Contractual Life Remaining 4 years 1 month 6 days 3 years 8 months 12 days
Aggregate Intrinsic Value    
Beginning Balance $ 653 $ 2,428
Exercised 35 401
Forfeited or expired $ 28 136
Ending Balance   653
Exercisable at end of period   414
Expected to Vest   $ 239