Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 14,354	$ 31,073
Restricted Cash	1,877	1,877
Accounts receivable, net of allowance for doubtful accounts of $619 as of September 30, 2012 and $684 as of December 31, 2011	15,660	25,278
Advance billings	1,720	5,071
Inventories	33,309	29,203
Prepaid expenses and other current assets	4,561	9,024
Total current assets	71,481	101,526
Property and equipment, net	7,387	10,552
Intangibles, net	500	750
Other assets	701	1,015
Total assets	80,069	113,843
Current liabilities:
Accounts payable	11,767	16,785
Accrued compensation and benefits	4,496	5,781
Deferred revenue-current	6,189	12,117
Other current liabilities	7,518	10,666
Total current liabilities	29,970	45,349
Deferred revenues, non-current	3,059	3,158
Other long-term liabilities	3,748	5,191
Total liabilities	36,777	53,698
Commitments and contingencies (Note 6)
Stockholders' equity:
Preferred stock, 2,000 shares authorized; none issued and outstanding	0	0
Common stock, par value $0.001, 120,000 shares authorized; 62,744 shares issued and 58,654 shares outstanding as of September 30, 2012; 62,547 shares issued and 58,366 shares outstanding as of December 31, 2011	63	63
Additional paid-in capital	652,041	650,110
Accumulated other comprehensive income	21,007	20,472
Treasury stock, 4,181 shares as of September, 2012 and December 31, 2011	(37,986)	(37,986)
Accumulated deficit	(591,833)	(572,514)
Total stockholders' equity	43,292	60,145
Total liabilities and stockholders' equity	$ 80,069	$ 113,843