Stock-based Compensation Plans and Awards - Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |
|
|
|
|
| Stock-based compensation included in net loss |
$ 1,680
|
$ 1,559
|
$ 6,118
|
$ 5,683
|
| Accelerated compensation cost |
|
|
800
|
|
| Service Costs |
|
|
|
|
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |
|
|
|
|
| Stock-based compensation included in net loss |
142
|
182
|
1,054
|
806
|
| Sales and Marketing |
|
|
|
|
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |
|
|
|
|
| Stock-based compensation included in net loss |
145
|
159
|
586
|
511
|
| Product Development |
|
|
|
|
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |
|
|
|
|
| Stock-based compensation included in net loss |
290
|
397
|
1,206
|
1,576
|
| General and Administrative |
|
|
|
|
| Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |
|
|
|
|
| Stock-based compensation included in net loss |
$ 1,103
|
$ 821
|
$ 3,272
|
$ 2,790
|