Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 23,917,000	$ 24,614,000
Accounts receivable	4,345,000	4,489,000
Prepaid and other current assets	493,000	267,000
Total current assets	28,755,000	29,370,000
Other assets
Property and equipment - net of accumulated depreciation	55,000	0
Patents and patent applications - net of accumulated amortization	15,000	16,000
Total assets	28,825,000	29,386,000
Current liabilities
Accounts payable and accrued expenses	1,074,000	1,133,000
License fees	4,500,000	5,400,000
Accrued salaries and wages	879,000	1,084,000
Royalty payable	935,000	998,000
Deferred revenue	1,374,000	1,212,000
Total current liabilities	8,762,000	9,827,000
Long-term liabilities
License fees	0	2,700,000
Total long-term liabilities	0	2,700,000
Total liabilities	8,762,000	12,527,000
Stockholders' equity
Common stock; par value $0.001; 200,000,000 shares authorized; 4,025,500 and 3,845,361 shares issued and outstanding at June 30, 2019 and December 31, 2018, respectively	4,000	4,000
Additional paid-in capital	94,638,000	91,276,000
Accumulated deficit	(74,579,000)	(74,421,000)
Total stockholders' equity	20,063,000	16,859,000
Total liabilities and stockholders' equity	$ 28,825,000	$ 29,386,000