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Condensed Consolidated Statements Of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Cash flows from operating activities:    
Net loss $ (1,619,780) $ (1,273,046)
Adjustments to reconcile net loss to net cash used in operating activities:    
Share-based compensation expense 688,074 803,407
Depreciation 475,456 512,871
Write-off of deferred financing costs and discount on long-term debt   153,101
(Gain) Loss on disposal of equipment (13,055) 44,450
Amortization of deferred financing costs 52,277 26,151
Amortization of discount on long-term debt   21,707
Amortization of intangible assets 3,125 16,875
Amortization/accretion on investments 10,658  
Change in allowance for doubtful accounts 14,448 6,063
Changes in assets and liabilities:    
Accounts receivable (177,278) 179,718
Inventories (449,629) (292,105)
Other current assets (132,935) (76,899)
Accounts payable (64,861) (69,300)
Accrued liabilities 193,224 (938,856)
Other non-current assets and non-current liabilities (63,335) 14,289
Net cash used in operating activities (1,083,611) (871,574)
Cash flows from investing activities:    
Purchases of property and equipment (661,954) (388,734)
Purchases of available-for-sale securities (1,496,617) (3,281,340)
Maturities of available-for-sale securities 1,437,500 3,650,000
Net proceeds from the sale of equipment 23,905 89,476
Net cash (used in) provided by investing activities (697,166) 69,402
Cash flows from financing activities:    
Payments on debt and capital leases (6,551,983) (2,895,313)
Proceeds from debt borrowings 10,000,000 7,500,000
Payment of debt fees (25,000) (25,719)
Proceeds from stock option exercises 212,767 221,382
Shares repurchased for payment of taxes on stock awards (198,073) (468,445)
Net cash provided by financing activities 3,437,711 4,331,905
Effect of exchange rate changes on cash and cash equivalents 2,523 (74,696)
Net increase (decrease) in cash and cash equivalents 1,659,457 3,455,037
Cash and cash equivalents-beginning of period 9,758,903 4,230,709
Cash and cash equivalents-end of period 11,418,360 7,685,746
Supplemental cash flow information:    
Cash paid for interest 128,185 57,175
Cash paid for taxes 11,500 15,000
Non-cash investing and financing activities:    
Accrued purchases of property and equipment 55,493 25,575
Assets acquired through capital lease   $ 26,655