Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 32,197,521	$ 30,980,473
Accounts receivable	4,205,306	7,218,367
Prepaid and other current assets	1,023,222	1,055,816
Total current assets	37,426,049	39,254,656
Other assets
Property and equipment - net	199,067	243,039
Right of use assets - operating leases	627,563	768,441
Patents and patent applications - net of accumulated amortization	14,030	14,373
Total assets	38,266,709	40,280,509
Current liabilities
Accounts payable and accrued expenses	1,450,478	1,316,773
Accrued salaries and wages	599,295	1,237,661
Royalty payable	934,004	1,620,182
Deferred revenue	842,419	918,272
Operating leases - current	499,901	516,931
Total current liabilities	4,326,097	5,609,819
Long-term liabilities
Operating leases - long term	131,020	254,664
Total long-term liabilities	131,020	254,664
Total liabilities	4,457,117	5,864,483
Stockholders' equity
Common stock; par value $0.001; 200,000,000 shares authorized; 4,258,105 and 4,186,438 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	4,259	4,187
Additional paid-in capital	98,611,083	97,239,455
Accumulated other comprehensive loss	(293,491)	0
Accumulated deficit	(64,512,259)	(62,827,616)
Total stockholders' equity	33,809,592	34,416,026
Total liabilities and stockholders' equity	$ 38,266,709	$ 40,280,509