Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2012	Dec. 31, 2011
Current assets
Cash and cash equivalents	$ 6,722,311	$ 8,939,127
Accounts receivable, net	7,729,108	5,958,086
Inventory, net	3,569,999	3,330,773
Prepaid expenses	962,612	1,071,438
Other current assets	36,717	35,717
Total current assets	19,020,747	19,335,141
Property and equipment, net	2,470,723	2,816,674
Intangible assets, net	449,477	539,563
Other assets	171,668	228,043
Total assets	22,112,615	22,919,421
Current Liabilities
Current portion of long term debt obligation	1,625,000	1,625,000
Current portion of capital lease obligation	53,288	50,949
Accounts payable	2,357,536	1,656,602
Accrued liabilities	2,927,932	3,612,193
Deferred credits	1,103,353	1,462,603
Total current liabilities	8,067,109	8,407,347
Long-term debt obligation	2,500,000	3,625,000
Long-term lease obligation	142,745	183,008
Total liabilities	10,709,854	12,215,355
Commitments and contingencies
Stockholders' equity:
Preferred stock, par value $0.001, 1,321,514 shares authorized, issued and outstanding at September 30, 2012 and December 31, 2011	1,322	1,322
Common stock, par value $0.001, 100,000,000 shares authorized, 14,005,851 and 13,812,490 shares issued and outstanding at September 30, 2012 and December 31, 2011, respectively	14,221	13,969
Additional paid-in capital	60,880,410	59,289,516
Accumulated deficit	(49,493,192)	(48,600,741)
Total stockholders' equity	11,402,761	10,704,066
Total liabilities and stockholders' equity	$ 22,112,615	$ 22,919,421