Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 29, 2013	Dec. 31, 2012
Current assets
Cash and cash equivalents	$ 11,629	$ 14,354
Restricted cash	2,082	1,877
Accounts receivable, net of allowance for doubtful accounts of $586 as of September 29, 2013 and $541 as of December 31, 2012	30,735	15,660
Advance billings	2,976	1,720
Inventories	31,215	33,309
Prepaid expenses and other current assets	2,726	4,561
Total current assets	81,363	71,481
Property and equipment, net	6,369	7,387
Intangibles, net	313	500
Other assets	838	701
Total assets	88,883	80,069
Current liabilities:
Accounts payable	17,472	11,767
Accrued compensation and benefits	3,301	4,496
Deferred revenues, current	6,374	6,189
Revolving credit facility	20,000	0
Other current liabilities	4,345	7,518
Total current liabilities	51,492	29,970
Deferred revenues, non-current	2,399	3,059
Other long-term liabilities	3,627	3,748
Total liabilities	57,518	36,777
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; 63,238 shares issued and 59,057 shares outstanding as of September 29, 2013; 62,908 shares issued and 58,727 shares outstanding as of December 31, 2012	63	63
Additional paid-in capital	653,395	652,041
Accumulated other comprehensive income	21,213	21,007
Treasury stock, 4,181 shares as of September 29, 2013 and December 31, 2012	(37,986)	(37,986)
Accumulated deficit	(605,320)	(591,833)
Total stockholders' equity	31,365	43,292
Total liabilities and stockholders' equity	$ 88,883	$ 80,069