Intangible assets and Goodwill (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

The following table summarizes intangible assets as of December 31, 2018 and 2017 (in thousands):

	Weighted-Average	December 31, 2018
	Amortization Period (Years)	Gross Carrying Amount		Accumulated Amortization			Net Book Value
Trademarks	5	$	1,900	$	(1,900	)	$	—
Technology	3	1,678		(1,192		)	486
Customer relationships	5	1,300		(1,300		)	—
Total		$	4,878	$	(4,392	)	$	486

	Weighted-Average	December 31, 2017
	Amortization Period (Years)	Gross Carrying Amount		Accumulated Amortization			Net Book Value
Trademarks	5	$	1,900	$	(1,678	)	$	222
Technology	3	1,453		(646		)	807
Customer relationships	5	1,300		(1,148		)	152
Total		$	4,653	$	(3,472	)	$	1,181

Summary of the Future Amortization Expense of Purchased Intangible Assets

The estimated future amortization expense of purchased intangible assets as of December 31, 2018, is as follows (in thousands):

	Total
2019	$	398
2020	75
2021	13
Thereafter	—
Total	$	486