Intangible Assets

12 Months Ended

Dec. 31, 2017

Intangible Assets [Abstract]

Intangible Assets

5.   Intangible Assets

Intangible assets subject to amortization at December 31, 2017 consisted of the following.

(In thousands)	Gross Carrying Amount		Accumulated Amortization			Net
Acquired technology	$	1,733	$	(1,733	)		—
Distributor and provider networks		8,709		(8,709	)		—
Total	$	10,442	$	(10,442	)	$	—

Intangible assets subject to amortization at December 31, 2016 consisted of the following.

(In thousands)	Gross Carrying Amount		Accumulated Amortization			Net
Acquired technology	$	6,422	$	(6,422	)		—
Distributor and provider networks		8,709		(8,709	)		—
Total	$	15,131	$	(15,131	)	$	—

As all intangible assets subject to amortization were fully amortized as of December 31, 2017, no amortization expense is expected over the next five years and thereafter.  Total amortization expense for the years ended December 31, 2017, 2016, and 2015 was $0, $0.5 million, and $0.5 million, respectively.

Intangible assets not subject to amortization at December 31, 2017 and 2016 consist of a tradename of $29.0 million.