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Condensed Consolidated Balance Sheets (USD $)
Jun. 30, 2013
Sep. 30, 2012
Current assets:    
Cash and cash equivalents $ 15,057,571 $ 13,859,505
Accounts receivable, less allowance of $3,972 and $4,372 for doubtful accounts 1,166,598 5,517,894
Inventories, net 5,245,315 3,112,489
Prepaid expenses and other 466,497 441,823
Total current assets 21,935,981 22,931,711
Property and equipment, net 258,197 212,863
Intangible assets, net 138,583 158,457
Prepaid expenses and other - noncurrent 961,391 1,102,016
Total assets 23,294,152 24,405,047
Current liabilities:    
Accounts payable 909,048 995,719
Accrued liabilities 524,851 623,742
Total current liabilities 1,433,899 1,619,461
Other liabilities - noncurrent 419,362 363,817
Total liabilities 1,853,261 1,983,278
Common stock, $0.00001 par value; 50,000,000 shares authorized; 32,499,199 and 32,374,499 shares issued and outstanding, respectively 325 324
Additional paid-in capital 87,045,296 86,358,011
Accumulated deficit (65,604,730) (63,936,566)
Total stockholders' equity 21,440,891 22,421,769
Total liabilities and stockholders' equity $ 23,294,152 $ 24,405,047