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Intangible Assets
6 Months Ended
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Intangible assets, net of amortization, consisted of intellectual property and totaled $1.0 million and $1.2 million as of June 30, 2016 and December 31, 2015, respectively. Amortization expense of intangible assets were approximately $122,000 and $90,000 for the six months ended June 30, 2016 and 2015, respectively. The terms of the 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. As of June 30, 2016, intangible assets not yet placed into service totaled approximately $0.4 million.

The following table illustrates the estimated future amortization expense of intangible assets as of June 30, 2016 (in thousands):
Fiscal Year Ending December 31,
 
Estimated Amortization Expense
2016 - remainder of the year
 
$
164

2017
 
280

2018
 
214

2019
 
214

2020
 
117

Thereafter
 
42

Total
 
$
1,031