Note 3 - Fixed Assets

Fixed assets are recorded at cost and, once placed in service, are depreciated on the straight-line method over their estimated useful lives. Leasehold improvements are accreted over the shorter of the estimated economic life or related lease terms. Fixed assets consist of the following:


	Estimated	As of March 31,		As of December 31,
	Useful Lives in Years	2019		2018

Manufacturing facility/clean room	3 - 8	$	3,082,000	$	3,076,000
Leasehold improvements	10		6,075,000		6,075,000
Office furniture and equipment	5 - 10		511,000		511,000
Lab equipment	5 - 8		1,128,000		1,128,000
Less accumulated depreciation and amortization			(5,118,000)		(4,793,000)

Fixed assets, net		$	5,678,000	$	5,997,000

Depreciation expense for the respective periods is as follows:


	Three Months Ended March 31,
	2019		2018

Depreciation Expense	$	325,000	$	301,000