Goodwill and Intangible Assets - Changes to Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 2,910	$ 2,910
Translation adjustment	(621)	(178)
Accumulated amortization	(1,320)	(1,134)
Balance	969	1,598
Trademark [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	300	300
Translation adjustment	(53)	(19)
Accumulated amortization	(247)	(215)
Balance		66
Developed Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,370	1,370
Translation adjustment	(298)	(83)
Accumulated amortization	(617)	(538)
Balance	455	749
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,240	1,240
Translation adjustment	(270)	(76)
Accumulated amortization	(456)	(381)
Balance	$ 514	$ 783