Condensed Consolidated Balance Sheet (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 14,153	$ 14,898
Accounts receivable, net of allowance for doubtful accounts of $0 at March 31, 2012 and December 31, 2011	15,826	15,782
Other receivables	1,026	865
Inventories	3,095	3,363
Restricted cash	303	303
Prepaid expenses and other current assets	5,846	2,851
Total current assets	40,249	38,062
Property and equipment, net	2,792	2,701
Other long-term assets	329	339
Intangible assets, net	2,922	3,141
Goodwill	5,575	5,575
Total assets	51,867	49,818
Current liabilities
Accounts payable	2,126	4,087
Product warranty	1,229	983
Accrued payroll and other accruals	13,318	10,143
Deferred revenue, current	18,945	18,220
Borrowings, current	6,500	6,500
Total current liabilities	42,118	39,933
Deferred revenue, long-term	4,577	4,273
Borrowings, long-term	1,333	1,833
Other long-term liabilities	167	165
Total liabilities	48,195	46,204
Commitments (Note 8)
Stockholders' deficit
Common stock, $0.0003 par value - 30,423,297 authorized shares, 3,999,915 and 3,3780,490 issued and outstanding shares at March 31, 2012 and December 31, 2011, respectively	1	1
Additional paid in capital	8,013	7,461
Accumulated deficit	(57,697)	(56,861)
Total stockholders’ deficit	(49,683)	(49,399)
Total liabilities, convertible preferred stock and stockholders’ deficit	51,867	49,818
Convertible Preferred Stock
Current liabilities
Convertible preferred stock; $0.0003 par value - 26,103,736 authorized shares; 12,193,313 and 12,171,809 issued and outstanding shares at March 31, 2012 and December 31, 2011, respectively	$ 53,355	$ 53,013