Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Gross Carrying Amount and Accumulated Amortization for Intangible Assets Resulting from Acquisitions

The following table summarizes the gross carrying amount and accumulated amortization for intangible assets resulting from acquisitions (in thousands):

	Existing			Customer
	Technology			Relationship			Total
Amortization period (in years)		11.75		4.0 – 11.75
Gross carrying amount at December 31, 2016	$	4,600		$	10,639		$	15,239
Accumulated amortization		(2,809	)		(6,610	)		(9,419	)
Intangible Assets, net at December 31, 2016	$	1,791		$	4,029		$	5,820
Gross carrying amount at December 31, 2017	$	4,600		$	10,639		$	15,239
Accumulated amortization		(3,257	)		(7,617	)		(10,874	)
Intangible Assets, net at December 31, 2017	$	1,343		$	3,022		$	4,365

Amortization Expense Included in Consolidated Statements of Operations

The following table illustrates the amortization expense included in the consolidated statements of operations for the years ended December 31, 2017 and 2016 (in thousands):

	Year Ended December 31,
	2017		2016
Cost of revenue	$	448	$	448
Selling and marketing		1,007		1,007
Total	$	1,455	$	1,455

Estimated Future Amortization Expense of Purchased Intangible Assets with Definite Lives

The estimated annual future amortization expense for purchased intangible assets with definite lives over the next five years is as follows (in thousands):

2018	$	1,455
2019		1,455
2020		1,455
Thereafter		—
Total	$	4,365