Acquired Intangible Assets

3 Months Ended

Apr. 30, 2017

Goodwill And Intangible Assets Disclosure [Abstract]

Acquired Intangible Assets

8. Acquired Intangible Assets

Intangible assets acquired in a business combination are recorded under the purchase method of accounting at their estimated fair values at the date of acquisition. The Company amortizes acquired intangible assets over their estimated useful lives.

The following table reflects the carrying value of intangible assets as of April 30, 2017: 

	Cost		Accumulated Amortization			Net Book Value
Intellectual property	$	3,505	$	(1,899	)	$	1,606
Access to facilities contract		38		(38	)		—
Total	$	3,543	$	(1,937	)	$	1,606

The following table reflects the carrying value of intangible assets as of January 31, 2017:

	Cost		Accumulated Amortization			Net Book Value
Intellectual property	$	3,505	$	(1,811	)	$	1,694
Access to facilities contract		38		(38	)		—
Total	$	3,543	$	(1,849	)	$	1,694

Amortization expense of intangible assets was $88 for each of the three months ended April 30, 2017 and 2016.