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Stock-Based Compensation - Schedule of Equity Incentive Plans Outstanding and Exercisable Options by Exercise Price Range (Detail) - Jun. 30, 2015 - $ / shares
shares in Thousands
Total
$2.80 - $3.27 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit $ 2.80
Range of Exercise Prices Per Share, Upper Range Limit $ 3.27
Options Outstanding 192
Options Outstanding, Weighted Average Remaining Contractual Life 6 years 2 months 23 days
Options Outstanding, Weighted Average Exercise Price $ 3.12
Options Exercisable 172
Options Exercisable, Weighted Average Exercise Price $ 3.11
$3.51 - $3.51 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 3.51
Range of Exercise Prices Per Share, Upper Range Limit $ 3.51
Options Outstanding 35
Options Outstanding, Weighted Average Remaining Contractual Life 7 years 1 month 10 days
Options Outstanding, Weighted Average Exercise Price $ 3.51
Options Exercisable 22
Options Exercisable, Weighted Average Exercise Price $ 3.51
$3.58 - $3.58 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 3.58
Range of Exercise Prices Per Share, Upper Range Limit $ 3.58
Options Outstanding 175
Options Outstanding, Weighted Average Remaining Contractual Life 8 years 1 month 17 days
Options Outstanding, Weighted Average Exercise Price $ 3.58
Options Exercisable 175
Options Exercisable, Weighted Average Exercise Price $ 3.58
$3.73 - $4.31 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 3.73
Range of Exercise Prices Per Share, Upper Range Limit $ 4.31
Options Outstanding 52
Options Outstanding, Weighted Average Remaining Contractual Life 6 years 2 months 1 day
Options Outstanding, Weighted Average Exercise Price $ 3.88
Options Exercisable 47
Options Exercisable, Weighted Average Exercise Price $ 3.88
$4.60 - $4.60 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 4.60
Range of Exercise Prices Per Share, Upper Range Limit $ 4.60
Options Outstanding 164
Options Outstanding, Weighted Average Remaining Contractual Life 7 years 11 months 1 day
Options Outstanding, Weighted Average Exercise Price $ 4.60
Options Exercisable 119
Options Exercisable, Weighted Average Exercise Price $ 4.60
$4.86 - $6.66 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 4.86
Range of Exercise Prices Per Share, Upper Range Limit $ 6.66
Options Outstanding 195
Options Outstanding, Weighted Average Remaining Contractual Life 8 years 1 month 6 days
Options Outstanding, Weighted Average Exercise Price $ 6.21
Options Exercisable 66
Options Exercisable, Weighted Average Exercise Price $ 5.32
$6.76 - $6.90 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 6.76
Range of Exercise Prices Per Share, Upper Range Limit $ 6.90
Options Outstanding 200
Options Outstanding, Weighted Average Remaining Contractual Life 8 years 2 months 16 days
Options Outstanding, Weighted Average Exercise Price $ 6.85
Options Exercisable 157
Options Exercisable, Weighted Average Exercise Price $ 6.85
$7.05 - $8.00 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 7.05
Range of Exercise Prices Per Share, Upper Range Limit $ 8.00
Options Outstanding 47
Options Outstanding, Weighted Average Remaining Contractual Life 7 years 6 months 7 days
Options Outstanding, Weighted Average Exercise Price $ 7.29
Options Exercisable 12
Options Exercisable, Weighted Average Exercise Price $ 8.00
$8.66 - $8.66 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 8.66
Range of Exercise Prices Per Share, Upper Range Limit $ 8.66
Options Outstanding 251
Options Outstanding, Weighted Average Remaining Contractual Life 9 years 4 months 13 days
Options Outstanding, Weighted Average Exercise Price $ 8.66
$8.75 - $17.36 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 8.75
Range of Exercise Prices Per Share, Upper Range Limit $ 17.36
Options Outstanding 259
Options Outstanding, Weighted Average Remaining Contractual Life 7 years 8 months 16 days
Options Outstanding, Weighted Average Exercise Price $ 12.07
Options Exercisable 126
Options Exercisable, Weighted Average Exercise Price $ 11.80
$2.80 - $17.36 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices Per Share, Lower Range Limit 2.80
Range of Exercise Prices Per Share, Upper Range Limit $ 17.36
Options Outstanding 1,570
Options Outstanding, Weighted Average Remaining Contractual Life 7 years 10 months 28 days
Options Outstanding, Weighted Average Exercise Price $ 6.70
Options Exercisable 896
Options Exercisable, Weighted Average Exercise Price $ 5.56