XML 142 R123.htm IDEA: XBRL DOCUMENT v3.8.0.1
Schedule of Significant Option Groups Outstanding (Detail)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Shares | shares 531
Options Exercisable, Shares | shares 233
Options Outstanding, Weighted-Average Exercise Price $ 13.92
Options Exercisable, Weighted-Average Exercise Price $ 2.95
$1.48 - $2.58  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 2 years 2 months 8 days
Options Outstanding, Shares | shares 99
Options Exercisable, Shares | shares 99
Range Of Exercise Prices, Lower Limit $ 1.48
Range Of Exercise Prices, Upper Limit 2.58
Options Outstanding, Weighted-Average Exercise Price 1.81
Options Exercisable, Weighted-Average Exercise Price $ 1.81
$2.67 - $7.71  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 3 years 2 months 1 day
Options Outstanding, Shares | shares 126
Options Exercisable, Shares | shares 126
Range Of Exercise Prices, Lower Limit $ 2.67
Range Of Exercise Prices, Upper Limit 7.71
Options Outstanding, Weighted-Average Exercise Price 2.89
Options Exercisable, Weighted-Average Exercise Price $ 2.89
$18.10 - $19.43  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 4 years 5 months 23 days
Options Outstanding, Shares | shares 194
Options Exercisable, Shares | shares 8
Range Of Exercise Prices, Lower Limit $ 18.10
Range Of Exercise Prices, Upper Limit 19.43
Options Outstanding, Weighted-Average Exercise Price 18.91
Options Exercisable, Weighted-Average Exercise Price $ 18.51
$28.56  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options Outstanding, Weighted-Average Remaining Contractual Life (Years) 6 years 29 days
Options Outstanding, Shares | shares 112
Range Of Exercise Prices, Upper Limit $ 28.56
Options Outstanding, Weighted-Average Exercise Price $ 28.56