Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 81,895	$ 93,547
Restricted cash	1,780	1,905
Accounts receivable, net	15,851	19,273
Inventories, net	21,535	26,464
Prepaid inventories, net	1,988	1,912
Prepaids and other assets	10,589	12,897
Total current assets	133,638	155,998
Fixed assets, net	25,937	21,037
Goodwill	2,784	2,784
Other long-term assets, net	2,867	2,166
Total assets	165,226	181,985
Current liabilities:
Accounts payable	46,753	62,416
Accrued liabilities	46,871	47,674
Deferred revenue	31,531	38,411
Total current liabilities	125,155	148,501
Other long-term liabilities	2,049	2,522
Total liabilities	127,204	151,023
Commitments and contingencies (Note 5)
Stockholders' equity:
Preferred stock, $0.0001 par value: Authorized shares - 5,000 Issued and outstanding shares - none
Common stock, $0.0001 par value Authorized shares - 100,000 Issued shares - 26,774 and 26,481 Outstanding shares - 23,650 and 23,451	2	2
Additional paid-in capital	357,647	356,895
Accumulated deficit	(239,399)	(247,096)
Treasury stock: Shares at cost - 3,124 and 3,030	(80,228)	(78,839)
Total stockholders' equity	38,022	30,962
Total liabilities and stockholders' equity	$ 165,226	$ 181,985