Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 30,863	$ 22,760
Accounts receivable, net of allowance for doubtful accounts of $683 as of June 28, 2015 and $669 as of December 31, 2014	26,294	33,578
Advance billings	3,329	4,653
Inventories	42,768	40,579
Prepaid expenses and other current assets	7,515	9,767
Total current assets	110,769	111,337
Property and equipment, net	9,587	7,534
Restricted cash	1,979	1,993
Other assets	530	623
Total assets	122,865	121,487
Current liabilities:
Accounts payable	13,128	22,434
Accrued compensation and benefits	7,017	4,601
Deferred revenues, current	7,371	9,110
Other current liabilities	6,739	6,630
Total current liabilities	34,255	42,775
Deferred revenues, non-current	755	1,160
Other liabilities	2,504	2,442
Total liabilities	$ 37,514	$ 46,377
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; 79,376 shares issued and 75,021 shares outstanding as of June 28, 2015; 78,267 shares issued and 74,009 shares outstanding as of December 31, 2014	79	78
Additional paid-in capital	690,685	687,871
Accumulated other comprehensive income	17,129	18,171
Treasury stock, 4,355 shares as of June 28, 2015 and 4,258 shares as of December 31, 2014	(38,501)	(38,083)
Accumulated deficit	(584,041)	(592,927)
Total stockholders' equity	85,351	75,110
Total liabilities and stockholders' equity	$ 122,865	$ 121,487