Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 27, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 21,006	$ 33,427
Accounts receivable, net of allowance for doubtful accounts of $672 as of March 27, 2016 and $672 as of December 31, 2015	26,476	21,685
Advance billings	2,111	1,639
Inventories	48,275	50,020
Prepaid expenses and other current assets	5,327	6,057
Total current assets	103,195	112,828
Property and equipment, net	9,002	8,236
Restricted cash	1,811	1,811
Other assets	405	438
Total assets	114,413	123,313
Current liabilities:
Accounts payable	14,040	16,912
Accrued compensation and benefits	2,917	4,707
Deferred revenues, current	5,649	5,144
Other current liabilities	4,692	6,195
Total current liabilities	27,298	32,958
Deferred revenues, non-current	250	375
Other liabilities	2,638	2,456
Total liabilities	$ 30,186	$ 35,789
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; 80,120 shares issued and 75,647 shares outstanding as of March 27, 2016; 79,853 shares issued and 75,443 shares outstanding as of December 31, 2015	80	80
Additional paid-in capital	693,068	692,407
Accumulated other comprehensive income	16,553	16,289
Treasury stock, 4,473 shares as of March 27, 2016 and 4,410 shares as of December 31, 2015	(38,861)	(38,640)
Accumulated deficit	(586,613)	(582,612)
Total stockholders' equity	84,227	87,524
Total liabilities and stockholders' equity	$ 114,413	$ 123,313