Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 33,443,273	$ 48,251,336
Marketable securities	15,072,325	0
Accounts receivable	9,725,388	8,910,975
Prepaid and other current assets	2,277,000	1,936,842
Total current assets	60,517,986	59,099,153
Other assets
Property and equipment - net	108,932	171,190
Right of use assets - operating leases	1,119,129	278,455
Patents and patent applications - net	12,314	13,000
Other non-current assets	0	1,051,234
Total assets	61,758,361	60,613,032
Current liabilities
Accounts payable and accrued expenses	2,446,983	2,966,479
Accrued salaries and wages	890,999	908,516
Royalty payable	2,106,864	1,908,072
Deferred revenue	0	354,756
Operating leases	339,222	282,421
Total current liabilities	5,784,068	6,420,244
Long-term liabilities
Operating leases - long term	780,898	0
Convertible debt, net of unamortized discount	18,837,331	18,700,546
Total long-term liabilities	19,618,229	18,700,546
Total liabilities	25,402,297	25,120,790
Stockholders' equity
Common stock; par value $0.001; 200,000,000 shares authorized; 4,349,599 and 4,258,105 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	4,350	4,259
Additional paid-in capital	102,220,294	100,203,979
Accumulated other comprehensive loss	(18,876)	(26,931)
Accumulated deficit	(65,849,704)	(64,689,065)
Total stockholders' equity	36,356,064	35,492,242
Total liabilities and stockholders' equity	$ 61,758,361	$ 60,613,032