Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 17,343	$ 14,578
Accounts receivable, net of allowance for doubtful accounts of $709 as of March 30, 2014 and $704 as of December 31, 2013	37,130	26,245
Advance billings	3,871	3,346
Inventories	43,554	34,126
Prepaid expenses and other current assets	8,361	5,267
Total current assets	110,259	83,562
Property and equipment, net	9,047	9,216
Restricted cash	2,086	2,087
Other assets	940	1,058
Total assets	122,332	95,923
Current liabilities:
Accounts payable	29,283	26,624
Accrued compensation and benefits	3,532	2,713
Deferred revenues, current	10,938	9,107
Revolving credit facility	0	14,000
Other current liabilities	6,359	4,122
Total current liabilities	50,112	56,566
Deferred revenues, non-current	1,768	1,971
Other liabilities	3,029	3,237
Total liabilities	54,909	61,774
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; 77,618 shares issued and 73,437 shares outstanding as of March 30, 2014; 62,908 shares issued and 58,727 shares outstanding as of December 31, 2013	78	63
Additional paid-in capital	685,460	654,050
Accumulated other comprehensive income	20,214	20,830
Treasury stock, 4,181 shares as of March 30, 2014 and December 31, 2013	(37,986)	(37,986)
Accumulated deficit	(600,343)	(602,808)
Total stockholders' equity	67,423	34,149
Total liabilities and stockholders' equity	$ 122,332	$ 95,923