Stock-Based Compensation - Expense (Detail) - USD ($) $ in Thousands |
1 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Feb. 28, 2014 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Stock-based compensation expense, by operating expense category | ||||
| Stock-based compensation expense | $ 4,400 | $ 5,056 | $ 374 | $ 4,545 |
| Platform operations | ||||
| Stock-based compensation expense, by operating expense category | ||||
| Stock-based compensation expense | 756 | 71 | 14 | |
| Sales and marketing | ||||
| Stock-based compensation expense, by operating expense category | ||||
| Stock-based compensation expense | 1,707 | 127 | 50 | |
| Technology and development | ||||
| Stock-based compensation expense, by operating expense category | ||||
| Stock-based compensation expense | 1,513 | 85 | 909 | |
| General and administrative | ||||
| Stock-based compensation expense, by operating expense category | ||||
| Stock-based compensation expense | $ 3,500 | $ 1,080 | $ 91 | $ 3,572 |