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