CONSOLIDATED BALANCE SHEETS - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 3,373,388	$ 3,659,534
Short-term investment securities	50,081,013	58,975,513
Accounts receivable	1,283,094	957,066
Inventory, net	2,942,967	3,282,537
Prepaid expenses and other assets	1,321,550	746,805
Total current assets	59,002,012	67,621,455
Machinery and equipment, net	3,417,162	3,316,047
Other assets:
Intangible assets, net	8,640,302	7,435,411
Investment	7,513,581	1,366,493
Total other assets	16,153,883	8,801,904
Total assets	78,573,057	79,739,406
Current liabilities:
Current portion of note payable	390,016	0
Accounts payable	3,049,808	2,080,691
Accrued expenses	1,920,816	1,987,675
Deferred revenue	249,972	28,350
Warrant liability	167,779	216,490
Total current liabilities	5,778,391	4,313,206
Long-term portion of note payable	285,210	0
Total liabilities	6,063,601	4,313,206
Commitments and contingencies (Note 10)	0	0
Shareholders' equity
Common stock value	1,243	1,236
Capital in excess of par value	169,056,133	166,592,536
Accumulated other comprehensive loss	(28,184)	0
Accumulated deficit	(96,519,736)	(91,167,572)
Total shareholders' equity	72,509,456	75,426,200
Total liabilities and shareholders' equity	$ 78,573,057	$ 79,739,406