Goodwill and Intangible Assets - Changes to Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 2,910	$ 2,910
Foreign currency translation adjustment	(607)	(621)
Accumulated amortization	(1,395)	(1,320)
Balance	908	969
Trademark [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	300	300
Foreign currency translation adjustment	(65)	(53)
Accumulated amortization	(235)	(247)
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,370	1,370
Foreign currency translation adjustment	(284)	(298)
Accumulated amortization	(663)	(617)
Balance	423	455
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,240	1,240
Foreign currency translation adjustment	(258)	(270)
Accumulated amortization	(497)	(456)
Balance	$ 485	$ 514