Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents	$ 31,073	$ 16,863
Short-term investments	0	2,151
Restricted cash	1,877	4,026
Accounts receivable, net of allowance for doubtful accounts of $684 in 2011 and $681 in 2010	25,278	24,127
Advance billings	5,071	3,177
Inventories	29,203	34,673
Prepaid expenses and other current assets	9,024	5,770
Total current assets	101,526	90,787
Property and equipment, net	10,552	15,011
Intangibles, net	750	1,000
Other assets	1,015	4,826
Total assets	113,843	111,624
Current liabilities:
Accounts payable	16,785	20,860
Accrued liabilities	16,447	13,452
Deferred revenue	12,117	5,349
Total current liabilities	45,349	39,661
Income taxes payable, non-current	1,312	4,287
Other liabilities	7,037	5,021
Total liabilities	53,698	48,969
Commitments and contingencies (Note 7)
Stockholders' equity:
Preferred stock, 2,000 shares authorized; none issued and outstanding	0	0
Common stock, par value $0.001, 120,000 shares authorized; 62,547 shares issued and 58,366 shares outstanding in 2011; 54,440 shares issued and 50,259 shares outstanding in 2010	63	54
Additional paid-in capital	650,110	634,944
Accumulated other comprehensive income	20,472	20,207
Treasury stock, 4,181 shares in 2011 and 2010, at cost	(37,986)	(37,986)
Accumulated deficit	(572,514)	(554,564)
Total stockholders' equity	60,145	62,655
Total liabilities and stockholders' equity	$ 113,843	$ 111,624