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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
CASH FLOWS FROM OPERATING ACTIVITIES  
Net income (loss)$ 4,012,590$ (203,465)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:  
Accretion of premiums and discounts on marketable securities(13,288)5,236
Share-based compensation884,290920,755
Depreciation and amortization332,254295,020
Loss on change in fair value of warrants495,216486,964
Gain on sale of assets(750,000) 
Deferred revenues recognized(1,720,997)(1,077,933)
Changes in other assets and liabilities impacting cash flows from operations:  
Accounts receivable1,080,093177,480
Inventory(801,911)(99,330)
Prepaid and other assets595,970625,652
Accounts payable, accrued compensation and other accrued expenses(53,780)(513,474)
Other liabilities(19,331)(43,001)
NET CASH PROVIDED BY OPERATING ACTIVITIES4,041,106573,904
CASH FLOWS FROM INVESTING ACTIVITIES  
Purchases of marketable securities(1,499,337)(12,742,296)
Proceeds from maturities and sales of marketable securities11,115,00010,885,000
Proceeds from sale of assets750,000 
Restricted cash(834)(332)
Purchases of property, plant and equipment(271,078)(128,896)
NET CASH PROVIDED BY (USED IN) INVESTING ACTIVITIES10,093,751(1,986,524)
CASH FLOWS FROM FINANCING ACTIVITIES  
Stock option exercises515,68925,993
Settlements of restricted stock for tax withholding obligations(233,757)(42,490)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES281,932(16,497)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS14,416,789(1,429,117)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD8,884,4027,613,378
CASH AND CASH EQUIVALENTS AT END OF PERIOD$ 23,301,191$ 6,184,261