Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 10,811	$ 14,354
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	12,611	15,660
Advance billings	2,585	1,720
Inventories	33,991	33,309
Prepaid expenses and other current assets	3,456	4,561
Total current assets	65,331	71,481
Property and equipment, net	6,794	7,387
Intangibles, net	438	500
Other assets	640	701
Total assets	73,203	80,069
Current liabilities:
Accounts payable	15,157	11,767
Accrued compensation and benefits	4,140	4,496
Deferred revenue-current	7,073	6,189
Other current liabilities	6,653	7,518
Total current liabilities	33,023	29,970
Deferred revenues, non-current	2,839	3,059
Other long-term liabilities	3,668	3,748
Total liabilities	39,530	36,777
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	652,418	652,041
Accumulated other comprehensive income	20,519	21,007
Treasury stock, 4,181 shares as of September, 2012 and December 31, 2011	(37,986)	(37,986)
Accumulated deficit	(601,341)	(591,833)
Total stockholders' equity	33,673	43,292
Total liabilities and stockholders' equity	$ 73,203	$ 80,069