Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Stock Option Activity (Detail)

v3.10.0.1
Stockholders' Equity - Summary of Stock Option Activity (Detail)
shares in Thousands
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Total Options, Beginning balance | shares 4,826
Total Options, Granted | shares 901
Total Options, Exercised | shares (95)
Total Options, Forfeited/cancelled/expired | shares (104)
Total Options, Ending balance | shares 5,528
Weighted-Average Exercise Price, Beginning balance | $ / shares $ 5.05
Weighted-Average Exercise Price, Granted | $ / shares 5.14
Weighted-Average Exercise Price, Exercised | $ / shares 1.09
Forfeited/cancelled/expired | $ / shares 4.44
Weighted-Average Exercise Price, Ending balance | $ / shares $ 5.15