Stock-Based Compensation - Allocation of Stock-Based Compensation Expense, Stock Options (Details) - USD ($)
$ in Thousands |
12 Months Ended |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Equity Incentive Plans |
|
|
|
| Share-based compensation expense by statement of operations line item |
|
|
|
| Change in fair value included in total share based compensation |
$ (200)
|
$ 500
|
|
| Stock options |
|
|
|
| Share-based compensation expense by statement of operations line item |
|
|
|
| Stock-based compensation expense |
3,353
|
2,339
|
$ 579
|
| Stock options | Other cost of revenue |
|
|
|
| Share-based compensation expense by statement of operations line item |
|
|
|
| Stock-based compensation expense |
75
|
20
|
6
|
| Stock options | Sales and marketing |
|
|
|
| Share-based compensation expense by statement of operations line item |
|
|
|
| Stock-based compensation expense |
720
|
505
|
212
|
| Stock options | Research and development |
|
|
|
| Share-based compensation expense by statement of operations line item |
|
|
|
| Stock-based compensation expense |
1,114
|
756
|
276
|
| Stock options | General and administrative |
|
|
|
| Share-based compensation expense by statement of operations line item |
|
|
|
| Stock-based compensation expense |
$ 1,444
|
$ 1,058
|
$ 85
|