Change in Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill [Line Items]
Balance, beginning of period	$ 14,471us-gaap_Goodwill	$ 990us-gaap_Goodwill	$ 971us-gaap_Goodwill
Effect of exchange rate changes	(1,648)us-gaap_GoodwillTranslationAdjustments	289us-gaap_GoodwillTranslationAdjustments	19us-gaap_GoodwillTranslationAdjustments
Balance, end of period	12,823us-gaap_Goodwill	14,471us-gaap_Goodwill	990us-gaap_Goodwill
Acquisition of RTP
Goodwill [Line Items]
Goodwill acquisition		641
Balance, end of period	641
Acquisition of ATT Systems
Goodwill [Line Items]
Goodwill acquisition		12,551
Balance, end of period	$ 12,551

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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