Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 2,553	$ 4,889
Short-term marketable securities, available-for-sale	79,358	42,224
Accounts receivable, net	12,547	6,671
Inventory	8,171	8,112
Restricted cash	0	775
Prepaid and other current assets	1,781	2,690
Total current assets	104,410	65,361
Property and equipment, net	15,019	10,763
Restricted cash	939	939
Other assets	107	101
Total assets	120,475	77,164
Liabilities and stockholders' equity
Accounts payable and accrued liabilities	6,346	5,350
Accrued payroll and related expenses	6,804	5,730
Current portion of long-term debt	0	525
Current portion of deferred revenue	1,591	3,524
Total current liabilities	14,741	15,129
Other liabilities	963	1,042
Long-term portion of deferred revenue	281	0
Total liabilities	15,985	16,171
Commitments and contingencies (Note 4)
Stockholders' equity:
Preferred stock, $0.001 par value per share, 5,000 shares authorized; no shares issued and outstanding at December 31, 2011 and December 31, 2010, respectively.	0	0
Common stock, $0.001 par value per share, 100,000 authorized; 67,833 and 67,549 shares issued and outstanding, respectively, at December 31, 2011, and 62,360 and 62,078 shares issued and outstanding, respectively, at December 31, 2010	68	62
Additional paid-in capital	495,626	407,375
Accumulated other comprehensive loss	(80)	(66)
Accumulated deficit	(391,124)	(346,378)
Total stockholders' equity	104,490	60,993
Total liabilities and stockholders' equity	$ 120,475	$ 77,164

Amount due from customers, within one year of the balance sheet date (or the normal operating cycle, whichever is longer), for goods or services (including trade receivables) that have been delivered or sold in the normal course of business, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and by estimated sales returns.

No definition available.