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Summary of Significant Accounting Policies - Stock-Based Compensation (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Nov. 11, 2014
shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2014
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
item
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
Additional disclosure for options          
Cash received for exercise of stock options | $       $ 4,791 $ 1,316
2006 Plan          
Stock-Based Compensation          
Number of employee share-based compensation plans | item       1  
Additional number of shares authorized for issuance | shares 5,500,000        
Common stock authorized for issuance (in shares) | shares 17,500,000        
Additional disclosure for options          
Stock compensation expense | $   $ 4,500 $ 3,600 $ 10,200 $ 8,900
Estimated fair value of unvested employee awards, net of estimated forfeitures | $       $ 32,800  
Weighted average vesting period of unvested employee awards       2 years  
Number of Stock Options          
Granted (in shares) | shares       1,676,599  
2006 Plan | Stock options          
Weighted-average assumptions used to estimate the fair value of each stock option          
Number of group of awards for which expected term is calculated for and applied | item       1  
Dividend (as a percent)   0.00% 0.00% 0.00% 0.00%
Volatility (as a percent)   65.20% 60.95% 66.86% 60.87%
Risk-free interest rate (as a percent)   1.67% 1.81% 1.86% 1.88%
Expected life   6 years 3 months 18 days 6 years 3 months 18 days 6 years 3 months 18 days 6 years 3 months 18 days
Weighted-average grant date fair values of options granted (in dollars per share) | $ / shares   $ 7.49 $ 5.77 $ 9.99 $ 6.24
Additional disclosure for options          
Stock options exercised (in shares) | shares       461,000  
Cash received for exercise of stock options | $       $ 4,800  
2006 Plan | Stock options | Maximum          
Stock-Based Compensation          
Vesting period       4 years  
Exercise period       10 years  
Additional disclosure for options          
Exercised (in dollars per share) | $ / shares       $ 17.00  
2006 Plan | Stock options | Minimum          
Additional disclosure for options          
Exercised (in dollars per share) | $ / shares       $ 3.19