Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 53,084	$ 57,294
Accounts receivable, net of allowance of $6 and $14 as of December 31, 2013 and December 31, 2012, respectively	9,719	1,050
Inventories, net	20,186	16,657
Prepaid expenses and other current assets	4,202	7,013
Total current assets	87,191	82,014
Property and equipment, net	2,465	3,523
Other long-term assets	50	335
Total assets	89,706	85,872
Current liabilities:
Accounts payable	10,250	10,192
Deferred revenue	2,828	2,303
Accrued liabilities and other	6,661	4,265
Total current liabilities	19,739	16,760
Other long-term liabilities	0	29
Total liabilities	19,739	16,789
Commitments and Contingencies (Note 4)
Stockholders’ equity:
Preferred stock, $0.001 par value; 1,000 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.001 par value; authorized — 25,000; issued — 6,901 and 6,738 shares, as of December 31, 2013 and December 31, 2012, respectively; outstanding — 6,639 and 6,555 shares as of December 31, 2013 and December 31, 2012, respectively	7	7
Treasury stock, 263 shares at December 31, 2013 and 183 shares at December 31, 2012	(3,479)	(2,182)
Additional paid-in capital	816,826	814,411
Accumulated other comprehensive income	16	16
Accumulated deficit	(743,403)	(743,169)
Total stockholders’ equity	69,967	69,083
Total liabilities and stockholders’ equity	$ 89,706	$ 85,872