6.	Composition of Certain Financial Statement Captions

Inventories, net

As of December 31, 2017 and 2016, inventories, net, were comprised of the following (in thousands):

Other Current Assets

As of December 31, 2017 and 2016, other current assets were comprised of the following (in thousands):

	December 31,
	2017		2016
Prepaid supplies or services, current	$	544	$	734
Prepaid insurance		556		83
Prepaid consumption tax in Japan		99		2
Other receivables		112		51
	$	1,311	$	870

Property and Equipment, net

As of December 31, 2017 and 2016, property and equipment, net, were comprised of the following (in thousands):

	December 31,
	2017			2016
Manufacturing and development equipment	$	4,507		$	4,256
Office and computer equipment		1,805			1,953
Leasehold improvements		5,087			3,399
		11,399			9,608
Less accumulated depreciation		(8,347	)		(8,451	)
	$	3,052		$	1,157

Depreciation expense totaled $0.9 million and $0.7 million for the years ended December 31, 2017 and 2016, respectively.

Other Assets

As of December 31, 2017 and 2016, other assets were comprised of the following (in thousands):

Accounts Payable and Accrued Expenses

As of December 31, 2017 and 2016, accounts payable and accrued expenses were comprised of the following (in thousands):