Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 47,686	$ 14,898
Short-term investments	73,355	0
Accounts receivable, net of allowance for doubtful accounts of $0 at June 30, 2012 and December 31, 2011	20,643	15,782
Other receivables	227	865
Inventories	3,228	3,363
Restricted cash	304	303
Prepaid expenses and other current assets	2,249	2,851
Total current assets	147,692	38,062
Property and equipment, net	2,616	2,701
Other long-term assets	352	339
Intangible assets, net	2,485	3,141
Goodwill	5,575	5,575
Total assets	158,720	49,818
Current liabilities
Accounts payable	2,911	4,087
Product warranty	593	983
Accrued payroll and other accruals	9,367	10,143
Deferred revenue, current	20,562	18,220
Borrowings, current	0	6,500
Total current liabilities	33,433	39,933
Deferred revenue, long-term	4,935	4,273
Borrowings, long-term	0	1,833
Other long-term liabilities	814	165
Total liabilities	39,182	46,204
Commitments (Note 10)
Stockholders' equity (deficit)
Common stock, $0.0003 par value - 100,000,000 shares and 30,423,297 shares authorized as of June 30, 2012 and December 31, 2011, respectively; 22,138,561 and 3,780,490 issued and outstanding shares at June 30, 2012 and December 31, 2011, respectively	7	1
Additional paid in capital	174,391	7,461
Accumulated other comprehensive loss	(81)	0
Accumulated deficit	(54,779)	(56,861)
Total stockholders’ equity (deficit)	119,538	(49,399)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	158,720	49,818
Convertible Preferred Stock
Current liabilities
Convertible preferred stock: $0.0003 par value - no shares and 26,103,736 shares authorized as of June 30, 2012 and December 31, 2011, respectively; zero and 12,171,980 issued and outstanding shares at June 30, 2012 and December 31, 2011, respectively. Preferred stock, $0.0003 par value - 5,000,000 shares authorized; no shares issued and outstanding.	0	53,013
Preferred Stock
Current liabilities
Convertible preferred stock: $0.0003 par value - no shares and 26,103,736 shares authorized as of June 30, 2012 and December 31, 2011, respectively; zero and 12,171,980 issued and outstanding shares at June 30, 2012 and December 31, 2011, respectively. Preferred stock, $0.0003 par value - 5,000,000 shares authorized; no shares issued and outstanding.	$ 0	$ 0