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Stockholders' Equity - Summary of Exercise Price (Detail)
shares in Thousands
3 Months Ended
Mar. 31, 2017
$ / shares
shares
$2.96 to $5.35 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum $ 2.96
Range of Exercise Prices Maximum $ 5.35
Options Outstanding Shares | shares 360
Weighted Average Remaining Contractual Life 2 years
Weighted Average Exercise Price Per Share, Options Outstanding $ 2.96
Options Exercisable Shares | shares 360
Weighted Average Exercise Price Per Share, Options Exercisable $ 2.96
$5.36 to $5.67 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum 5.36
Range of Exercise Prices Maximum $ 5.67
Options Outstanding Shares | shares 133
Weighted Average Remaining Contractual Life 4 years 10 months 24 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 5.57
Options Exercisable Shares | shares 133
Weighted Average Exercise Price Per Share, Options Exercisable $ 5.57
$5.68 to $8.54 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum 5.68
Range of Exercise Prices Maximum $ 8.54
Options Outstanding Shares | shares 2,568
Weighted Average Remaining Contractual Life 3 years 9 months 18 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 5.74
Options Exercisable Shares | shares 2,568
Weighted Average Exercise Price Per Share, Options Exercisable $ 5.74
$8.55 to $8.90 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum 8.55
Range of Exercise Prices Maximum $ 8.9
Options Outstanding Shares | shares 903
Weighted Average Remaining Contractual Life 3 years 2 months 12 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 8.59
Options Exercisable Shares | shares 903
Weighted Average Exercise Price Per Share, Options Exercisable $ 8.59
$8.91 to $23.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum 8.91
Range of Exercise Prices Maximum $ 23
Options Outstanding Shares | shares 207
Weighted Average Remaining Contractual Life 6 years 10 months 24 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 22.89
Options Exercisable Shares | shares 207
Weighted Average Exercise Price Per Share, Options Exercisable $ 22.89
$23.01 to $37.97 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum 23.01
Range of Exercise Prices Maximum $ 37.97
Options Outstanding Shares | shares 1,233
Weighted Average Remaining Contractual Life 8 years 10 months 24 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 31.86
Options Exercisable Shares | shares 282
Weighted Average Exercise Price Per Share, Options Exercisable $ 28.33
$2.96 to $37.97 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Minimum 2.96
Range of Exercise Prices Maximum $ 37.97
Options Outstanding Shares | shares 5,404
Weighted Average Remaining Contractual Life 4 years 10 months 24 days
Weighted Average Exercise Price Per Share, Options Outstanding $ 12.65
Options Exercisable Shares | shares 4,453
Weighted Average Exercise Price Per Share, Options Exercisable $ 8.32