Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Changes in Gross Carrying Amount of Goodwill

The following table displays the changes in the gross carrying amount of goodwill:

	Amount
	(in thousands)
Balance at December 31, 2015	$	74,565
Logentries acquisition accounting adjustments	545
Balance at December 31, 2016	$	75,110
Komand acquisition	8,054
Balance at December 31, 2017	$	83,164

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 December 31, 2017							As of December 31, 2016
	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	5.7	$	20,611	$	(5,756	)	$	14,855	$	11,231	$	(3,118	)	$	8,113
Customer relationships	6.7	1,000		(351		)	649		1,000		(197		)	803
Trade names	6.1	519		(510		)	9		519		(496		)	23
Non-compete agreements	2.0	40		(40		)	—		40		(33		)	7
Total acquired intangible assets		22,170		(6,657		)	15,513		12,790		(3,844		)	8,946
Internal-use software		1,162		(35		)	1,127		—		—			—
Total intangible assets		$	23,332	$	(6,692	)	$	16,640	$	12,790	$	(3,844	)	$	8,946

Schedule of Estimated Amortization Expense

Estimated future amortization expense of the acquired identifiable intangible assets and completed capitalized internal-use software costs as of December 31, 2017 is as follows (in thousands):

2018	$	3,875
2019	3,847
2020	3,790
2021	3,208
2022	1,095
2023 and thereafter	—
Total	$	15,815