Goodwill and Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table displays the changes in goodwill:

	Amount
	(in thousands)
Balance at December 31, 2018	$	88,420
NetFort acquisition	9,446
Balance at June 30, 2019	$	97,866

Schedule of Identifiable Intangible Assets

The following table presents details of our intangible assets, which include acquired identifiable intangible assets and capitalized internal-use software costs:

		As of June 30, 2019							As of December 31, 2018
	Weighted- Average Life (years)	Gross Carrying Amount		Accumulated Amortization			Net Book Value		Gross Carrying Amount		Accumulated Amortization			Net Book Value
		(in thousands)
Intangible assets subject to amortization:
Developed technology	5.4	$	35,855	$	(12,761	)	$	23,094	$	29,771	$	(9,741	)	$	20,030
Customer relationships	6.7	1,000		(577		)	423		1,000		(504		)	496
Trade names	6.1	519		(518		)	1		519		(516		)	3
Non-compete agreements	2.0	40		(40		)	—		40		(40		)	—
Total acquired intangible assets		37,414		(13,896		)	23,518		31,330		(10,801		)	20,529
Internal-use software		6,938		(730		)	6,208		3,786		(360		)	3,426
Total intangible assets		$	44,352	$	(14,626	)	$	29,726	$	35,116	$	(11,161	)	$	23,955

Schedule of Estimated Amortization Expense

Estimated future amortization expense of the acquired identifiable intangible assets and completed capitalized internal-use software costs as of June 30, 2019 was as follows (in thousands):

2019 (for the remaining six months)	$	3,907
2020	7,771
2021	6,975
2022	4,298
2023	2,667
2024 and thereafter	304
Total	$	25,922