Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 45,277	$ 53,084
Accounts receivable, net of allowance of $1 and $6 as of June 30, 2014 and December 31, 2013, respectively	4,074	9,719
Inventories, net	17,738	20,186
Prepaid expenses and other current assets	3,708	4,202
Total current assets	70,797	87,191
Property and equipment, net	1,952	2,465
Other long-term assets	84	50
Total assets	72,833	89,706
Current liabilities:
Accounts payable	3,441	10,250
Deferred revenue	1,842	2,828
Accrued and other liabilities	3,224	6,661
Total current liabilities	8,507	19,739
Other long-term liabilities	14	0
Total liabilities	8,521	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 — 6,997 and 6,901 shares, as of June 30, 2014 and December 31, 2013, respectively; outstanding — 6,714 and 6,639 shares as of June 30, 2014 and December 31, 2013, respectively	7	7
Treasury stock	(3,818)	(3,479)
Additional paid-in capital	817,904	816,826
Accumulated other comprehensive income	16	16
Accumulated deficit	(749,797)	(743,403)
Total stockholders’ equity	64,312	69,967
Total liabilities and stockholders’ equity	$ 72,833	$ 89,706