Balance Sheets - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 7,200,795	$ 6,780,429
Accounts receivable, net	972,352	1,082,957
Inventories	2,494,268	2,861,864
Prepaid expenses and other current assets	962,727	860,915
Total current assets	11,630,142	11,586,165
Fixed assets, net	375,561	407,339
Operating Lease, Right-of-Use Asset	1,870,979	1,968,062
Other long-term assets	30,081	30,314
Total assets	13,906,763	13,991,880
Current liabilities:
Accounts payable	557,861	1,298,084
Accrued expenses and compensation	3,036,301	2,236,633
Accrued Sales Return provisions	726,892	1,101,658
Deferred Collaboration Income	181,818	1,956,522
Total current liabilities	4,502,872	6,592,897
Operating Lease, Liability, Noncurrent	1,211,480	1,301,172
Total liabilities	5,714,352	7,894,069
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.0001 par value; 100,000,000 shares authorized at March 31, 2019 and December 31, 2018; 8,310,463 and 7,380,463 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	831	738
Additional paid-in capital	197,157,649	197,113,646
Accumulated deficit	(188,966,084)	(191,016,591)
Total stockholders’ equity	8,192,411	6,097,811
Total liabilities and stockholders’ equity	13,906,763	13,991,880
Non-Convertible Preferred Stock
Stockholders’ equity:
Preferred stock	0	0
Convertible preferred stock
Stockholders’ equity:
Preferred stock	15	18
Total stockholders’ equity	$ 15	$ 18