Geographic information (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 39,127 $ 15,584
Long-Lived Assets 537 210
Americas [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 32,108 14,138
Europe [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues 5,639 1,442
Asia Pacific [Member]
   
Revenues from External Customers and Long-Lived Assets [Line Items]    
Revenues $ 1,380 $ 4