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Stock-Based Compensation Stock-Based Compensation - Stock Options Assumed from Acquisition (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 08, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Assumed options from business acquisition       $ 1,375 $ 0  
Dividend rate       0.00%    
Number of Options            
Outstanding, beginning balance (in shares)       3,547,528    
Exercised (in shares)       (518,421)    
Forfeited (in shares)       (74,593)    
Vested and expected to vest (in shares)   3,212,169   3,212,169    
Exercisable (in shares)   1,978,792   1,978,792    
Outstanding, ending balance (in shares)   3,191,202   3,191,202   3,547,528
Weighted Average Exercise Price per Share            
Outstanding, beginning balance, weighted average exercise price per share (in dollars per share)       $ 6.91    
Exercised, weighted average exercise price per share (in dollars per share)       2.29    
Forfeited, weighted average exercise price per share (in dollars per share)       12.14    
Vested and expected to vest, weighted average exercise price per share (in dollars per share)   $ 9.31   9.31    
Exercisable, weighted average exercise price per share (in dollars per share)   4.84   4.84    
Outstanding, ending balance, weighted average exercise price per share (in dollars per share)   $ 9.34   $ 9.34   $ 6.91
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value            
Outstanding, weighted average remaining contractual life       6 years 6 months   6 years 4 months 24 days
Vested and expected to vest, weighted average remaining contractual life       6 years 6 months    
Exercisable, weighted average remaining contractual life       5 years 6 months    
Outstanding, aggregate intrinsic value   $ 90,278   $ 90,278   $ 74,267
Vested and expected to vest, aggregate intrinsic value   90,959   90,959    
Exercisable, aggregate intrinsic value   $ 64,883   $ 64,883    
Weighted average grant date fair value for stock options (in dollars per share)       $ 14.54 $ 8.08  
Fair value of stock options vested during period       $ 1,900 $ 1,200  
Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected term   6 years 3 months 18 days   6 years 3 months 18 days    
Dividend rate   0.00% 0.00% 0.00% 0.00%  
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value            
Compensation cost not yet recognized on nonvested awards   $ 5,900   $ 5,900    
Compensation cost not yet recognized, period for recognition       2 years 3 months 18 days    
Minimum | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Volatility, minimum   44.50% 48.30% 44.50% 48.30%  
Expected term     5 years 7 months 6 days   5 years 7 months 6 days  
Risk-free interest rate, minimum   2.00% 1.30% 2.00% 1.30%  
Maximum | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Volatility, maximum   46.30% 50.60% 47.20% 50.60%  
Expected term     6 years 3 months 18 days   6 years 3 months 18 days  
Risk-free interest rate, maximum   2.10% 1.40% 2.20% 1.40%  
Connect            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Assumed (in shares) 70,406          
Unvested employee options converted (in shares) 2,001,387          
Fair value of unvested stock options $ 1,700          
Assumed options from business acquisition $ 1,400          
Number of Options            
Outstanding, beginning balance (in shares)       0    
Assumed (in shares) 70,406          
Exercised (in shares)       (1,676)    
Forfeited (in shares)       (7,275)    
Vested and expected to vest (in shares)   61,455   61,455    
Exercisable (in shares)   11,658   11,658    
Outstanding, ending balance (in shares)   61,455   61,455   0
Weighted Average Exercise Price per Share            
Outstanding, beginning balance, weighted average exercise price per share (in dollars per share)       $ 0.00    
Assumed, weighted average exercise price per share (in dollars per share) $ 5.48          
Exercised, weighted average exercise price per share (in dollars per share)       4.55    
Forfeited, weighted average exercise price per share (in dollars per share)       5.00    
Vested and expected to vest, weighted average exercise price per share (in dollars per share)   $ 5.57   5.57    
Exercisable, weighted average exercise price per share (in dollars per share)   5.61   5.61    
Outstanding, ending balance, weighted average exercise price per share (in dollars per share)   $ 5.57   $ 5.57   $ 0.00
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value            
Outstanding, weighted average remaining contractual life       7 years 8 months 12 days   0 days
Vested and expected to vest, weighted average remaining contractual life       7 years 8 months 12 days    
Exercisable, weighted average remaining contractual life       7 years 4 months 24 days    
Outstanding, aggregate intrinsic value   $ 1,970   $ 1,970   $ 0
Assumed, aggregate intrinsic value $ 1,688,000          
Vested and expected to vest, aggregate intrinsic value   1,970   1,970    
Exercisable, aggregate intrinsic value   373   $ 373    
Weighted average grant date fair value for stock options (in dollars per share)       $ 4.78    
Fair value of stock options vested during period       $ 100    
Aggregate intrinsic value of stock options exercised during the period       $ 100,000    
Compensation cost not yet recognized on nonvested awards   $ 200   $ 200    
Compensation cost not yet recognized, period for recognition       1 year 3 months 18 days    
Connect | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Volatility, minimum       42.70%    
Volatility, maximum       44.40%    
Risk-free interest rate, minimum       1.40%    
Risk-free interest rate, maximum       2.00%    
Connect | Minimum | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected term       2 years 6 months    
Connect | Maximum | Stock options            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expected term       5 years    
Options to be recognized over future vesting periods | Connect            
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value            
Compensation cost not yet recognized on nonvested awards $ 300