Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Stock Option Activity (Detail)

v3.19.1
Stock-Based Compensation - Summary of Stock Option Activity (Detail)
3 Months Ended
Mar. 31, 2019
$ / shares
shares
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Options Exercisable, Beginning Balance | shares 1,278,038
Options Exercisable, Ending Balance | shares 1,340,631
Weighted-Average Exercise Price Per Share, Beginning Balance | $ / shares $ 7.45
Weighted-Average Exercise Price Per Share, Ending Balance | $ / shares $ 7.59
Options Outstanding, Beginning Balance | shares 3,201,887
Options Outstanding, Granted | shares 180,000
Options Outstanding, Exercised | shares (34,402)
Options Outstanding, Forfeited or expired | shares (2,205)
Options Outstanding, Ending Balance | shares 3,345,280
Weighted-Average Exercise Price Per Share, Beginning Balance | $ / shares $ 10.67
Weighted-Average Exercise Price Per Share, Granted | $ / shares 13.01
Weighted-Average Exercise Price Per Share, Exercised | $ / shares 3.63
Weighted-Average Exercise Price Per Share, Forfeited or expired | $ / shares 13.29
Weighted-Average Exercise Price Per Share, Ending Balance | $ / shares $ 10.87