Goodwill and Intangible Assets - Changes to Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 2,910	$ 2,910
Foreign currency translation adjustment	(522)	(621)
Accumulated amortization	(1,519)	(1,320)
Balance	869	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	(240)	(298)
Accumulated amortization	(730)	(617)
Balance	400	455
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,240	1,240
Foreign currency translation adjustment	(217)	(270)
Accumulated amortization	(554)	(456)
Balance	$ 469	$ 514