Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 28, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 12,449	$ 14,578
Accounts receivable, net of allowance for doubtful accounts of $696 as of September 28, 2014 and $704 as of December 31, 2013	31,881	26,245
Advance billings	2,585	3,346
Inventories	38,548	34,126
Prepaid expenses and other current assets	6,697	5,267
Total current assets	92,160	83,562
Property and equipment, net	8,273	9,216
Restricted cash	2,001	2,087
Other assets	649	1,058
Total assets	103,083	95,923
Current liabilities:
Accounts payable	12,432	26,624
Accrued compensation and benefits	4,265	2,713
Deferred revenues, current	6,588	9,107
Revolving credit facility	0	14,000
Other current liabilities	5,195	4,122
Total current liabilities	28,480	56,566
Deferred revenues, non-current	1,363	1,971
Other liabilities	2,885	3,237
Total liabilities	32,728	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; 78,031 shares issued and 73,786 shares outstanding as of September 28, 2014; 62,908 shares issued and 58,727 shares outstanding as of December 31, 2013	78	63
Additional paid-in capital	687,154	654,050
Accumulated other comprehensive income	19,060	20,830
Treasury stock, 4,245 shares as of September 28, 2014 and 4,181 shares as of December 31, 2013	(38,047)	(37,986)
Accumulated deficit	(597,890)	(602,808)
Total stockholders' equity	70,355	34,149
Total liabilities and stockholders' equity	$ 103,083	$ 95,923