Components and Allocation of Purchase Price (Detail) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Dec. 14, 2016	Apr. 01, 2016
Business Acquisition [Line Items]
Goodwill	$ 60,979	$ 59,548
Atoll GmbH
Business Acquisition [Line Items]
Cash and cash equivalents				$ 1,409
Accounts receivable				697
Inventory				155
Other current assets				169
Fixed assets, net				114
Deferred tax assets				885
Accounts payable and other liabilities assumed				(599)
Deferred tax liabilities				(2,202)
Goodwill				17,077
Net assets acquired				25,266
Atoll GmbH | Customer relationships
Business Acquisition [Line Items]
Business combination, intangible assets				5,318
Atoll GmbH | Technology - developed
Business Acquisition [Line Items]
Business combination, intangible assets				2,175
Atoll GmbH | Non-competition agreements
Business Acquisition [Line Items]
Business combination, intangible assets				57
Atoll GmbH | Trademark
Business Acquisition [Line Items]
Business combination, intangible assets				$ 11
TangenX Technology Corporation
Business Acquisition [Line Items]
Cash and cash equivalents			$ 1,218
Accounts receivable			459
Other receivables			111
Inventory			936
Other current assets			50
Fixed assets, net			215
Accounts payable and other liabilities assumed			(3,083)
Deferred tax liabilities			(4,525)
Goodwill			29,501
Net assets acquired			37,150
TangenX Technology Corporation | Customer relationships
Business Acquisition [Line Items]
Business combination, intangible assets			6,192
TangenX Technology Corporation | Technology - developed
Business Acquisition [Line Items]
Business combination, intangible assets			6,044
TangenX Technology Corporation | Non-competition agreements
Business Acquisition [Line Items]
Business combination, intangible assets			21
TangenX Technology Corporation | Trademark
Business Acquisition [Line Items]
Business combination, intangible assets			$ 11