Segments and Geographic Information - Selected Information by Geographic Area (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2014	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 7,259	$ 11,537	$ 6,654	$ 7,016	$ 7,806	$ 7,126	$ 7,978	$ 6,316	$ 13,670	$ 25,207	$ 32,464	$ 29,226	$ 25,828
Total Assets	52,208	53,391	53,005	51,372	60,092				53,005	53,391	52,208	60,092
Total Long-lived Assets	13,137				13,315						13,137	13,315
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues											10,374	5,463	8,567
Total Assets	18,212				20,278						18,212	20,278
Total Long-lived Assets	245				306						245	306
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues											17,860	21,729	17,261
Total Assets	1,661				3,063						1,661	3,063
Total Long-lived Assets	529				22						529	22
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Assets	32,140				36,486						32,140	36,486
Total Long-lived Assets	12,361				12,987						12,361	12,987
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues											4,230	2,034
Total Assets	195				265						195	265
Total Long-lived Assets	2										2
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues											$ 22,090	$ 23,763	$ 17,261