Segments and Geographic Information - Selected Information by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	$ 11,247	$ 10,477
Total assets	56,809		$ 57,571
Total Long-lived assets	14,909		14,502
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	1,628	1,794
Total assets	21,589		21,423
Total Long-lived assets	698		663
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	7,757	6,341
Total assets	2,319		4,673
Total Long-lived assets	225		369
Nottingham, UK Facility [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	949	1,351
Total assets	32,730		31,288
Total Long-lived assets	13,983		13,468
Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenues	913	$ 991
Total assets	171		187
Total Long-lived assets	$ 3		$ 2