Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 97,735	$ 15,983
Restricted cash	40	40
Marketable securities	22,052
Accounts receivable, net of allowance for sales returns of $3 and $0, respectively	13,239	8,465
Inventories	11,538	20,242
Prepaid expenses and other current assets	2,409	2,659
Total current assets	147,013	47,389
Property and equipment, net	5,509	2,237
Long-term deposit	642	69
Restricted cash-noncurrent portion	170	170
Total assets	153,334	49,865
Current liabilities:
Equipment leasing		103
Accounts payable	5,427	7,711
Accrued and other current liabilities	7,435	4,405
Deferred credits and income	289	474
Financing obligation for construction in progress	630
Total current liabilities	13,781	12,693
Deferred rent-noncurrent portion	33	132
Convertible preferred stock warrant liability		1,137
Total liabilities	13,814	13,962
Commitments and contingencies (Note 8)
Convertible preferred stock: $0.001 par value- no shares authorized,issued or outstanding at September 30,2012; 400,424,913 shares authorized and 13,205,180 shares issued and outstanding at December 31, 2011		74,348
Shareholders' equity (deficit):
Preferred stock: $0.001 par value-50,000,000 shares authorized and no shares issued and outstanding at September 30, 2012; no shares authorized, issued or outstanding at December 31, 2011
Common stock: $0.001 par value - 500,000,000 shares authorized and 20,345,747 shares issued and outstanding at September 30, 2012; 600,000,000 shares authorized and 1,023,736 shares issued and outstanding at December 31, 2011	20	1
Additional paid-in capital	169,488	3,732
Accumulated other comprehensive income (loss)	1	(31)
Accumulated deficit	(29,989)	(42,147)
Total shareholders' equity (deficit)	139,520	(38,445)
Total liabilities, convertible preferred stock and shareholders' equity (deficit)	$ 153,334	$ 49,865