XML 40 R29.htm IDEA: XBRL DOCUMENT v3.5.0.2
Stock-Based Awards and Stock-Based Compensation - Additional Information (Detail)
1 Months Ended 3 Months Ended 6 Months Ended
May 31, 2015
USD ($)
offering_period
purchase_date
shares
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated stock-based compensation expense | $   $ 3,867,000 $ 5,646,000 $ 7,503,000 $ 11,290,000
Unrecognized stock-based compensation | $   $ 33,100,000   $ 33,100,000  
Weighted average remaining vesting period       2 years 6 months 30 days  
2015 Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Common stock reserved for future issuance (shares) 2,000,000        
Maximum employee contribution (percent) 15.00%        
Maximum employee contribution | $ $ 25,000        
Maximum employee purchase (shares) 3,000        
Offering period 12 months        
Duration of offering period 6 months        
Number of purchase dates per offering period | purchase_date 2        
Period between purchase dates 6 months        
Number of available offering periods to participants | offering_period 1        
Discount from market price (percent) 85.00%        
Shares issued (shares)   271,052   271,052  
Fair value per share (usd per share) | $ / shares   $ 3.78   $ 3.78  
2011 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted options vesting period       4 years  
Increase in number of shares available for issuance (shares)   5,000,000   5,000,000  
Increase in shares available for grant as a percentage of total shares outstanding (percent)       3.90%  
Maximum [Member] | 2011 Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted options expiration period       10 years  
Maximum [Member] | 2011 Equity Incentive Plan [Member] | Performance Shares and Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted options vesting period       4 years  
Minimum [Member] | 2011 Equity Incentive Plan [Member] | Performance Shares and Restricted Stock Units [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted options vesting period       1 year