INTANGIBLE ASSETS (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of the balances of amortizable intangible assets

As of December 31, 2017, the balances of amortizable intangible assets were as follows:



	Weighted-Average Amortization Period	Gross Intangible Assets		Accumulated Amortization			Net Intangible Assets
Patents	11.7 years	$	127	$	(54	)	$	73
License agreements		2,285		(269		)	2,016
Total amortizable assets		$	2,412	$	(323	)	$	2,089

As of December 31, 2016, the balances of amortizable intangible assets were as follows:



	Weighted-Average Amortization Period	Gross Intangible Assets		Accumulated Amortization			Net Intangible Assets
Patents	12.7 years	$	127	$	(47	)	$	80
License agreements		947		(29		)	918
Total amortizable assets		$	1,074	$	(76	)	$	998

Schedule of amortization expense of amortizable intangible assets

Amortization expense was $246, $35 and $6 for the years ended December 31, 2017, 2016 and 2015, respectively. Future amortization expenses are expected as follows:



Year Ending December 31:
2018	$	383
2019	388
2020	359
2021	302
2022	219
Thereafter	438
	$	2,089