Supplemental Balance Sheet Information (Tables)

9 Months Ended

Sep. 30, 2012

Supplemental Balance Sheet Information [Abstract]

Accounts receivables

Accounts receivable consist of the following (in thousands):

	September 30, 2012			December 31, 2011
Trade receivables	$	18,328		$	11,500
Allowance for doubtful accounts		(662	)		(337	)
	$	17,666		$	11,163

Inventory

We state inventories at the lower of cost or market, using the first-in-first-out-method (in thousands):

	September 30, 2012			December 31, 2011
Raw materials	$	6,897		$	6,493
Work in process		2,769			3,085
Finished goods		942			1,680
Allowances for obsolescence		(1,246	)		(1,819	)
	$	9,362		$	9,439

Property and Equipment

Property and equipment consist of the following (in thousands):

	September 30, 2012			December 31, 2011
Equipment	$	10,060		$	9,980
Demonstration units		2,149			1,345
Computers and purchased software		4,177			4,029
Furniture and fixtures		375			369
Leasehold improvements		7,647			7,425
Construction in progress		653			1,107
		25,061			24,255
Accumulated depreciation		(22,165	)		(21,394	)
	$	2,896		$	2,861

Accrued Expenses

Accrued expenses consist of the following (in thousands):

	September 30, 2012		December 31, 2011
Compensation and benefits	$	1,844	$	3,037
Warranty liability		614		583
Property, income, state, sales and franchise tax		336		529
Professional fees		466		463
Other		589		739
	$	3,849	$	5,351

Changes in warranty liability

Changes in our warranty liability are presented in the following table (in thousands):

Balance at December 31, 2011	$	613
Warranty expense		1,060
Warranty charges incurred		(1,009	)
Balance at September 30, 2012	$	664
Warranty liability included in accrued expenses	$	614
Long-term warranty liability		50
Balance at September 30, 2012	$	664