Other Balance Sheet Accounts

12 Months Ended

Dec. 31, 2017

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Other Balance Sheet Accounts

5. Other Balance Sheet Accounts

Property and equipment consisted of the following at December 31 (in thousands):

	2017			2016
Equipment	$	16,908		$	17,043
Leasehold improvements		8,144			8,144
		25,052			25,187
Less accumulated depreciation and amortization		(24,446	)		(24,014	)
	$	606		$	1,173

Depreciation and amortization of equipment and leasehold improvements for the years ended December 31, 2017, 2016 and 2015, was $0.6 million, $0.9 million and $0.9 million, respectively.

Intangible assets consisted of the following at December 31 (in thousands):

	2017			2016
Patent application costs	$	1,500		$	1,500
Accumulated amortization patent costs		(797	)		(690	)
	$	703		$	810

Amortization of licensed technology rights and patent application costs for the years ended December 31, 2017, 2016 and 2015, was $0.1 million, $0.1 million and $0.2 million, respectively. Estimated annual amortization for these assets is $0.1 million for each of the years in the period from 2018 to 2022, and $0.2 million being recognized thereafter.

Accounts payable and accrued expenses consisted of the following at December 31 (in thousands):

	2017		2016
Employee compensation	$	2,654	$	2,518
Clinical trial accruals		1,017		446
Accounts payable		1,213		326
Deferred rent		-		223
Other accrued liabilities		333		614
	$	5,217	$	4,127