Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Accounts receivable, net of allowance of $1 and $6 as of March 31, 2014 and December 31, 2013, respectively	$ 4,676	$ 9,719
Cash and cash equivalents	44,276	53,084
Inventories, net	21,880	20,186
Prepaid expenses and other current assets	2,477	4,202
Total current assets	73,309	87,191
Property and equipment, net	2,152	2,465
Other long-term assets	50	50
Total assets	75,511	89,706
Current liabilities:
Accounts payable	2,771	10,250
Deferred revenue	2,358	2,828
Accrued and other liabilities	2,661	6,661
Total current liabilities	7,790	19,739
Commitments and Contingencies (Note 7)
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 — 6,937 and 6,901 shares, as of March 31, 2014 and December 31, 2013, respectively; outstanding — 6,663 and 6,639 shares as of March 31, 2014 and December 31, 2013, respectively	7	7
Treasury stock	(3,679)	(3,479)
Additional paid-in capital	817,025	816,826
Accumulated other comprehensive income	16	16
Accumulated deficit	(745,648)	(743,403)
Total stockholders’ equity	67,721	69,967
Total liabilities and stockholders’ equity	$ 75,511	$ 89,706