|
Summary of significant accounting policies (Details 3) (USD $)
In Thousands, unless otherwise specified |
3 Months Ended |
|---|---|
|
Mar. 31, 2013
|
|
| Revenue recognition | |
| Obligations related to the earned fees and collection of the related receivable | 0 |
|
Platform service arrangements | Minimum
|
|
| Revenue recognition | |
| Term of the arrangement used to determine revenue recognition | 2 years |
|
Platform service arrangements | Maximum
|
|
| Revenue recognition | |
| Term of the arrangement used to determine revenue recognition | 5 years |
|
Wholesale partner arrangement | Minimum
|
|
| Revenue recognition | |
| Term of the arrangement used to determine revenue recognition | 3 years |
|
Wholesale partner arrangement | Maximum
|
|
| Revenue recognition | |
| Term of the arrangement used to determine revenue recognition | 15 years |