|
Related-party transactions (Details) (Consulting Agreement [Member], USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2012
|
Dec. 31, 2013
Scientific Advisor [Member]
|
Dec. 31, 2011
Scientific Advisor [Member]
|
|
| Related Party Transaction [Line Items] | |||
| Related party consulting agreement, general and administrative expense | $ 302 | $ 302 | $ 302 |