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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)
Mar. 31, 2012
Dec. 31, 2011
Current assets:    
Cash and cash equivalents $ 12,792,899 $ 11,167,745
Marketable securities 15,108,360 15,421,436
Accounts receivable, less reserve for doubtful accounts of $18,183 at March 31, 2012 and $10,000 at December 31, 2011 4,253,891 2,825,414
Royalties receivable 3,080,588 3,206,840
Inventories, net 13,845,705 13,363,073
Prepaid expenses and other current assets 1,660,146 910,298
Total current assets 50,741,589 46,894,806
Property, plant and equipment, at cost:    
Leasehold improvements 5,148,334 5,083,852
Equipment 12,301,405 12,011,154
Furniture and fixtures 1,292,055 1,244,451
Construction in progress 367,424 275,258
Total property, plant and equipment, at cost 19,109,218 18,614,715
Less: Accumulated depreciation (8,445,025) (7,877,296)
Property, plant and equipment, net 10,664,193 10,737,419
Long-term marketable securities 9,985,685 9,435,350
Intangible assets, net 7,808,130 7,795,239
Goodwill 994,000 994,000
Restricted cash 200,000 200,000
Total assets 80,393,597 76,056,814
Current liabilities:    
Accounts payable 1,721,334 1,422,483
Accrued liabilities 7,069,413 6,041,038
Total current liabilities 8,790,747 7,463,521
Other long-term liabilities 2,678,079 2,469,412
Long-term deferred tax liability 254,557 136,881
Commitments and contingencies      
Stockholders' equity:    
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding      
Common stock, $.01 par value, 40,000,000 shares authorized, 30,836,206 shares at March 31, 2012 and 30,714,757 shares at December 31, 2011 issued and outstanding 308,362 307,148
Additional paid-in capital 185,226,038 184,872,839
Accumulated other comprehensive income 1,201,452 113,627
Accumulated deficit (118,065,638) (119,306,614)
Total stockholders' equity 68,670,214 65,987,000
Total liabilities and stockholders' equity $ 80,393,597 $ 76,056,814