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Intangible Assets
3 Months Ended
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Intangible assets, net of amortization, consisted of intellectual property such as license agreements and totaled $1.0 million and $1.1 million as of March 31, 2017 and December 31, 2016, respectively. The terms of some of these license agreements provide for use of the licensed software into perpetuity while others are definite. The Company amortizes the cost of the license agreements over the estimated useful life, which can range between three to five years. Amortization expense related to intangible assets was approximately $81,000 and $61,000 for the three months ended March 31, 2017 and 2016, respectively.

The following table illustrates the estimated future amortization expense of intangible assets as of March 31, 2017 (in thousands):
Year Ending December 31,
 
Estimated Amortization Expense
2017
 
$
223

2018
 
247

2019
 
247

2020
 
149

2021
 
110

Thereafter
 
7

Total
 
$
983