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Condensed Consolidated Balance Sheets (USD $)
Sep. 30, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 35,906,861 $ 39,829,653
Marketable securities 18,169,844 21,793,550
Accounts receivable, less reserve for doubtful accounts of $10,000 7,052,908 4,946,132
Royalties and other receivables 52,915 6,730,818
Inventories 13,341,783 11,798,638
Deferred tax asset, net 8,962 1,984
Prepaid expenses and other current assets 1,159,352 1,249,824
Total current assets 75,692,625 86,350,599
Property, plant and equipment, at cost:    
Leasehold improvements 9,139,408 8,973,615
Equipment 13,937,516 13,684,954
Furniture and fixtures 2,267,094 2,116,017
Leased systems to customers and demonstration systems 60,505  
Construction in progress 1,596,606 21,647
Total property, plant and equipment, at cost 27,001,129 24,796,233
Less: Accumulated depreciation (13,810,261) (12,287,010)
Property, plant and equipment, net 13,190,868 12,509,223
Long-term deferred tax asset, net   184,848
Long-term marketable securities 10,007,186 12,218,602
Intangible assets, net 15,348,050 6,187,632
Goodwill 14,144,045 994,000
Restricted cash 450,000 200,000
Total assets 128,832,774 118,644,904
Current liabilities:    
Accounts payable 2,762,771 1,721,459
Accrued liabilities 7,708,102 9,579,712
Total current liabilities 10,470,873 11,301,171
Long-term deferred tax liability 88,764  
Other long-term liabilities 3,687,591 3,457,631
Commitments and contingencies (Note 11)      
Stockholders' equity:    
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding      
Common stock, $.01 par value, 80,000,000 shares authorized, 32,703,113 shares at September 30, 2014 and 31,925,741 shares at December 31, 2013 issued and outstanding 327,031 319,257
Additional paid-in capital 197,466,062 190,625,937
Accumulated other comprehensive income (2,718,884) 1,998,330
Accumulated deficit (80,488,663) (89,057,422)
Total stockholders' equity 114,585,546 103,886,102
Total liabilities and stockholders' equity $ 128,832,774 $ 118,644,904