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Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill And Intangible Assets Disclosure [Abstract]

6. Intangible Assets

Intangible assets as of December 31, 2018 and 2017 consist of the following:

	Weighted Average Remaining Useful Life	December 31,
		2018			2017
		(in thousands)
Acquired technology	20 Months	$	7,252		$	7,252
Accumulated amortization			(2,333	)		(940	)
Total		$	4,919		$	6,312

The estimated useful life of acquired technology is two to three years. The Company evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets.

Amortization expense related to intangible assets was $1.4 million in 2018, $103 thousand in 2017, and $84 thousand in 2016. Amortization expense of acquired technology is included in cost of subscription revenue in the consolidated statements of operations.

Estimated future amortization expense for intangible assets as of December 31, 2018 is as follows:

Years ended December 31,	Amortization Expense
	(in thousands)
2019		3,112
2020		1,807
Total	$	4,919