Condensed Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2011
Dec. 31, 2010
Dec. 31, 2009
ASSETS      
Cash and cash equivalents $ 6,498 $ 7,796 $ 5,295
Short-term investments - held to maturity 6,245 3,100 100
Accounts receivable, net 5,893 5,150 4,563
Inventory 2,119 1,905 2,179
Prepaid expenses and other current assets 857 777 687
Total current assets 21,612 18,728 12,824
Long-term investments - held to maturity 1,000 1,500  
Equipment, furniture and leasehold improvements, net 4,522 3,287 1,021
Intangible assets, net 36 39 43
Other assets 92 92 92
Deferred tax asset 9,056 9,056  
Total assets 36,318 32,702 13,980
LIABILITIES AND SHAREHOLDERS' EQUITY      
Accounts payable 1,021 1,100 1,122
Accrued compensation 1,631 1,975 956
Other accrued expenses 1,636 1,781 791
Advance payments 122 101 211
Deferred revenue 55 26 238
Warrant liability   7,694 34
Other current liabilities 235 170 891
Total current liabilities 4,700 12,847 4,243
Warrant liability   5,158 6,844
Total liabilities 4,700 18,005 11,087
Commitments and contingencies (Note 12)        
Shareholders' equity:      
Series B Convertible Preferred stock         
Common stock, $.001 par value: authorized 200,000,000 shares 23 21 17
Additional paid-in capital 219,465 206,298 193,358
Accumulated deficit (187,870) (191,622) (190,482)
Total shareholders' equity 31,618 14,697 2,893
Total liabilities and shareholders' equity $ 36,318 $ 32,702 $ 13,980