Balance Sheet Information (Tables)

3 Months Ended

Mar. 31, 2013

Basis of Presentation/Balance Sheet Information [Abstract]

Summary of Inventories

	March 31,		December 31,
	2013		2012
Raw materials	$	11,488	$	12,226
Work in process		844		789
Finished goods		4,516		4,558
Inventories, net	$	16,848	$	17,573

Summary of property and equipment

	March 31,			December 31,
	2013			2012
Building	$	6,207		$	6,207
Computers and office equipment		10,194			9,970
Manufacturing and test equipment		9,769			9,495
Furniture and fixtures		1,258			1,256
Leasehold improvements		580			519
Motor vehicles		150			150
Total property and equipment		28,158			27,597
Less: Accumulated depreciation and amortization		(15,226	)		(14,590	)
Land		1,770			1,770
Property and equipment, net	$	14,702		$	14,777

Summary of accrued liabilities

	March 31,		December 31,
	2013		2012
Inventory receipts	$	1,756	$	2,191
Paid time off		1,143		1,067
Professional fees		852		269
Payroll, bonuses, and other employee benefits		727		873
Warranties		277		270
Real estate taxes		213		170
Employee stock purchase plan		122		276
Sales tax		107		156
Deferred liabilities		105		127
Restructuring		77		0
Other		640		517
Total	$	6,019	$	5,916

Summary of Long-term liabilities

	March 31,		December 31,
	2013		2012
Executive deferred compensation plan	$	1,694	$	1,652
Reserve for uncertain tax positions		842		842
Deferred rent		166		166
Deferred revenues		78		74
Long-term obligations under capital leases		2		2
	$	2,782	$	2,736