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Composition of Assets, Grouped by Major Classifications (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 17,123	$ 13,001
Less - Accumulated depreciation	(10,197)	(8,196)
Property and equipment, net	6,926	4,805
Computers, software and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	13,570	10,031
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	797	766
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,756	$ 2,204

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02(13))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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