Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 20,117	$ 14,898
Short-term investments	59,724	0
Accounts receivable, net of allowance for doubtful accounts of $0 at June 30, 2012 and December 31, 2011	17,922	15,782
Other receivables	1,456	865
Inventories	2,932	3,363
Restricted cash	303	303
Prepaid expenses and other current assets	1,984	2,851
Total current assets	104,438	38,062
Property and equipment, net	2,694	2,701
Other long-term assets	1,208	339
Intangible assets, net	2,705	3,141
Goodwill	5,575	5,575
Total assets	116,620	49,818
Current liabilities
Accounts payable	2,125	4,087
Product warranty	776	983
Accrued payroll and other accruals	9,101	10,143
Deferred revenue, current	19,408	18,220
Borrowings, current	0	6,500
Total current liabilities	31,410	39,933
Deferred revenue, long-term	5,584	4,273
Borrowings, long-term	0	1,833
Other long-term liabilities	164	165
Total liabilities	37,158	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	136,162	7,461
Accumulated other comprehensive loss	(191)	0
Accumulated deficit	(56,516)	(56,861)
Total stockholders’ equity (deficit)	79,462	(49,399)
Total liabilities, convertible preferred stock and stockholders’ equity (deficit)	116,620	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