Business Combinations - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended	12 Months Ended
	Aug. 21, 2015	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Pro forma revenue, percent increase (less than)				0.10%	0.10%
Purchase price net of cash acquired				$ 12,797	$ 0	$ 42,369
Goodwill		$ 159,342	$ 172,087	$ 172,087	$ 159,342	159,342
Weighted average useful life (in years)				3 years 8 months
Technology
Business Acquisition [Line Items]
Useful life				7 years
BitYota, Inc.
Business Acquisition [Line Items]
Cash paid for acquisition	$ 12,800
Lemon Inc.
Business Acquisition [Line Items]
Cash paid for acquisition		42,400
Purchase price net of cash acquired		3,300
Goodwill		29,900				29,900
Intangible assets acquired		3,900				3,900
Net assets acquired		$ 3,200				3,200
Weighted average useful life (in years)		6 years
Lemon Inc. | Technology
Business Acquisition [Line Items]
Intangible assets acquired		$ 3,300				3,300
Useful life		7 years		7 years
Lemon Inc. | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired		$ 500				500
Lemon Inc. | Trade name and trademarks
Business Acquisition [Line Items]
Intangible assets acquired		$ 100				$ 100
Technology and Developement and General and Administrative | BitYota, Inc.
Business Acquisition [Line Items]
Acquisition related costs				$ 3,100
Intangible Assets, Amortization Period | Lemon Inc. | Technology
Business Acquisition [Line Items]
Weighted average useful life (in years)				2 years 3 months
Useful life			2 years 6 months	2 years 6 months