Segments and Geographic Information - Selected Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 10,213	$ 6,654	$ 18,539	$ 13,670
Total Assets	54,231		54,231		$ 52,208
Total Long-lived Assets	13,008		13,008		13,137
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	1,877	2,144	3,624	4,645
Total Assets	18,675		18,675		18,212
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	6,691	3,522	11,629	7,053
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	32,457		32,457		32,140
Total Long-lived Assets	11,993		11,993		12,361
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	1,645	$ 988	3,286	$ 1,972
Total Assets	3,099		3,099		1,856
Total Long-lived Assets	$ 1,015		$ 1,015		$ 776