Balance Sheets - USD ($)	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 9,116,806	$ 9,221,985
Accounts receivable, net	901,895	580,240
Inventories	1,072,162	679,740
Prepaid expenses and other current assets	878,533	608,160
Total current assets	11,969,396	11,090,125
Fixed assets, net	745,133	311,520
Other long-term assets	214,275	585
Total assets	12,928,804	11,402,230
Current liabilities:
Accounts payable	946,146	522,871
Accrued compensation	766,557	885,353
Accrued expenses	1,132,863	1,264,876
Current portion of deferred revenue	692,244	25,048
Total current liabilities	3,537,810	2,698,148
Deferred revenue, net of current portion	10,433	9,635
Common stock warrants	890,105	5,307,332
Total liabilities	$ 4,438,348	$ 8,015,115
Commitments and contingencies (Note 6)
Stockholders’ equity:
Preferred stock value	$ 0	$ 0
Common stock, $0.0001 par value; 50,000,000 shares authorized; 13,785,239 and 8,152,746 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	1,379	815
Additional paid-in capital	169,345,497	157,764,598
Accumulated deficit	(160,856,514)	(154,378,302)
Total stockholders’ equity	8,490,456	3,387,115
Total liabilities and stockholders’ equity	12,928,804	11,402,230
Series A Convertible Preferred Stock
Stockholders’ equity:
Preferred stock value	0	4
Series B Convertible Preferred Stock
Stockholders’ equity:
Preferred stock value	$ 94	$ 0