Segments and Geographic Information - Selected Information by Geographic Area (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenues $ 7,564 $ 11,455 $ 10,213 $ 8,326 $ 7,259 $ 11,537 $ 6,654 $ 7,016 $ 37,558 $ 32,464 $ 29,226
Total Assets 51,379       52,208       51,379 52,208  
Total Long-lived Assets 14,633       13,137       14,633 13,137  
United States [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenues                 7,677 10,374 5,463
Total Assets 16,256       18,212       16,256 18,212  
Total Long-lived Assets 765       245       765 245  
Switzerland [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenues                 22,410 17,860 21,729
Total Assets 1,570       1,661       1,570 1,661  
Total Long-lived Assets 49       529       49 529  
United Kingdom [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenues                 4,422 2,180 825
Total Assets 33,335       32,140       33,335 32,140  
Total Long-lived Assets 13,817       12,361       13,817 12,361  
Other Countries [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenues                 3,049 2,050 1,949
Total Assets 218       195       218 195  
Total Long-lived Assets $ 2       $ 2       2 2  
International [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total revenues                 $ 29,881 $ 22,090 $ 23,763