Quarterly report pursuant to Section 13 or 15(d)

Cash Proceeds Along with Fair Value Disclosures Related to Grants, Exercises, and Vested Options (Detail)

v3.8.0.1
Cash Proceeds Along with Fair Value Disclosures Related to Grants, Exercises, and Vested Options (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Proceeds from stock options exercised   $ 1 $ 3 $ 1
Intrinsic value of stock options exercised [1]     $ 1  
Weighted-average fair value of options granted during period $ 0.86 $ 1.13 $ 0.39 $ 0.99
Total fair value of shares vested during the period $ 302 $ 317 $ 1,000 $ 1,370
[1] The intrinsic value of stock options exercised is the amount by which the market price of the stock on the date of exercise exceeded the market price of the stock on the date of grant.