Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 29, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 20,667	$ 14,578
Accounts receivable, net of allowance for doubtful accounts of $687 as of June 29, 2014 and $704 as of December 31, 2013	24,501	26,245
Advance billings	3,839	3,346
Inventories	42,992	34,126
Prepaid expenses and other current assets	6,343	5,267
Total current assets	98,342	83,562
Property and equipment, net	8,863	9,216
Restricted cash	2,093	2,087
Other assets	799	1,058
Total assets	110,097	95,923
Current liabilities:
Accounts payable	19,930	26,624
Accrued compensation and benefits	4,159	2,713
Deferred revenues, current	6,347	9,107
Revolving credit facility	0	14,000
Other current liabilities	4,420	4,122
Total current liabilities	34,856	56,566
Deferred revenues, non-current	1,566	1,971
Other liabilities	3,021	3,237
Total liabilities	39,443	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; 77,877 shares issued and 73,682 shares outstanding as of June 29, 2014; 62,908 shares issued and 58,727 shares outstanding as of December 31, 2013	78	63
Additional paid-in capital	686,671	654,050
Accumulated other comprehensive income	20,347	20,830
Treasury stock, 4,195 shares as of June 29, 2014 and 4,181 shares as of December 31, 2013	(38,015)	(37,986)
Accumulated deficit	(598,427)	(602,808)
Total stockholders' equity	70,654	34,149
Total liabilities and stockholders' equity	$ 110,097	$ 95,923