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Stock-Based Compensation Stock-Based Compensation - Assumed Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 08, 2017
Mar. 31, 2017
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Dividend rate     0.00%    
Number of Options          
Outstanding, beginning balance (in shares)     3,547,528    
Vested and expected to vest (in shares)   3,473,524 3,473,524    
Exercisable (in shares)   2,224,394 2,224,394    
Outstanding, ending balance (in shares)   3,447,731 3,447,731   3,547,528
Weighted Average Exercise Price per Share          
Outstanding, beginning balance, weighted average exercise price per share (in dollars per share)     $ 6.91    
Vested and expected to vest, weighted average exercise price per share (in dollars per share)   $ 7.42 7.42    
Exercisable, weighted average exercise price per share (in dollars per share)   4.14 4.14    
Outstanding, ending balance, weighted average exercise price per share (in dollars per share)   $ 7.44 $ 7.44   $ 6.91
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value          
Outstanding, weighted average remaining contractual life     6 years 4 months 24 days   6 years 4 months 24 days
Vested and expected to vest, weighted average remaining contractual life     6 years 4 months 24 days    
Exercisable, weighted average remaining contractual life     5 years 4 months 24 days    
Outstanding, aggregate intrinsic value   $ 80,355 $ 80,355   $ 74,267
Vested and expected to vest, aggregate intrinsic value   81,016 81,016    
Exercisable, aggregate intrinsic value   59,170 59,170    
Assumed options from business acquisition     $ 1,375 $ 0  
Weighted average grant date fair value for stock options (in dollars per share)     $ 13.92 $ 7.47  
Fair value of stock options vested during period     $ 1,100 $ 300  
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Volatility, minimum     46.70%    
Volatility, maximum     47.20%    
Expected term     6 years 3 months 18 days 6 years 3 months 18 days  
Risk-free interest rate, minimum     2.10%    
Risk-free interest rate, maximum     2.20%    
Dividend rate     0.00% 0.00%  
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value          
Compensation cost not yet recognized on nonvested awards   $ 4,500 $ 4,500    
Compensation cost not yet recognized, period for recognition     2 years 2 months 12 days    
Connect          
Number of Options          
Outstanding, beginning balance (in shares)     0    
Assumed (in shares)     70,406    
Vested and expected to vest (in shares)   70,406 70,406    
Exercisable (in shares)   1,775 1,775    
Outstanding, ending balance (in shares)   70,406 70,406   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    
Vested and expected to vest, weighted average exercise price per share (in dollars per share)   $ 5.48 5.48    
Exercisable, weighted average exercise price per share (in dollars per share)   4.39 4.39    
Outstanding, ending balance, weighted average exercise price per share (in dollars per share)   $ 5.48 $ 5.48   $ 0.00
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value          
Outstanding, weighted average remaining contractual life     8 years    
Vested and expected to vest, weighted average remaining contractual life     8 years    
Exercisable, weighted average remaining contractual life     7 years 2 months 12 days    
Outstanding, aggregate intrinsic value   $ 1,778 $ 1,778   $ 0
Vested and expected to vest, aggregate intrinsic value   1,778 1,778    
Exercisable, aggregate intrinsic value   $ 46 46    
Unvested employee options converted (in shares)   2,001,387      
Fair value of unvested stock options $ 1,700        
Assumed options from business acquisition $ 1,400        
Compensation cost not yet recognized on nonvested awards   $ 300 $ 300    
Weighted average grant date fair value for stock options (in dollars per share)     $ 4.78    
Fair value of stock options vested during period     $ 100    
Compensation cost not yet recognized, period for recognition     1 year 10 months 24 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    
2015 Plan          
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value          
Additional shares of common stock (in shares) 2,308,615        
Two Thousand Fifteen Employee Stock Purchase Plan [Member] [Member]          
Weighted Average Remaining Contractual Life and Aggregate Intrinsic Value          
Additional shares of common stock (in shares) 461,723        
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