Equipment and Improvements

12 Months Ended

Dec. 31, 2017

Property Plant And Equipment [Abstract]

Equipment and Improvements

3. Equipment and Improvements

Equipment and improvements consist of the following (in thousands):

	December 31,
	2017			2016
Computer hardware, software, and equipment	$	14,617		$	14,617
Leasehold improvements		5,316			5,315
Office furniture and fixtures		962			1,073
		20,895			21,005
Less accumulated depreciation and amortization		(19,666	)		(19,194	)
Equipment and improvements, net	$	1,229		$	1,811

Depreciation and amortization expense on equipment and improvements was $0.7 million, $1.2 million, and $1.9 million for the years ended December 31, 2017, 2016, and 2015 respectively.