Balance Sheets - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 4,958,058	$ 6,780,429
Accounts receivable, net	726,670	1,082,957
Inventories	2,063,431	2,861,864
Prepaid expenses and other current assets	1,101,154	860,915
Total current assets	8,849,313	11,586,165
Fixed assets, net	289,472	407,339
Operating Lease, Right-of-Use Asset	1,645,668	1,968,062
Other long-term assets	29,824	30,314
Total assets	10,814,277	13,991,880
Current liabilities:
Accounts payable	1,017,094	1,298,084
Accrued expenses	3,081,192	2,236,633
Accrued Sales Return provisions	741,607	1,101,658
Deferred Collaboration Income	0	1,956,522
Total current liabilities	4,839,893	6,592,897
Operating Lease, Liability, Noncurrent	1,116,734	1,301,172
Total liabilities	5,956,627	7,894,069
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.0001 par value; 100,000,000 shares authorized at June 30, 2019 and December 31, 2018; 9,781,755 and 7,380,463 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	978	738
Additional paid-in capital	197,184,936	197,113,646
Accumulated deficit	(192,328,275)	(191,016,591)
Total stockholders’ equity	4,857,650	6,097,811
Total liabilities and stockholders’ equity	10,814,277	13,991,880
Non-Convertible Preferred Stock
Stockholders’ equity:
Preferred stock	0	0
Convertible preferred stock
Stockholders’ equity:
Preferred stock	11	18
Total stockholders’ equity	$ 11	$ 18