Condensed Consolidated Balance Sheets - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current Assets
Cash and cash equivalents	$ 18,414,542	$ 8,100,288
Investment in debt securities	459,295	7,389,407
Accounts receivable, net	1,086,258	14,011,180
Inventories	5,462,996	2,997,120
Prepaid and other current assets	1,683,976	1,505,175
Total Current Assets	27,107,067	34,003,170
Property and Equipment, Net	979,022	1,082,428
Patent Rights, Net	289,158	337,351
Deposits	101,988	101,561
Operating Lease Right-of-Use Assets, Net	1,232,568	1,400,037
Total Assets	29,709,803	36,924,547
Current Liabilities
Accounts payable and accrued expenses	2,860,885	4,779,435
Deferred revenue, current portion	1,518,255	1,191,898
Operating lease liabilities, current portion	301,217	309,524
Product warranties	119,692	187,454
Total Current Liabilities	4,800,049	6,468,311
Loan Payable	1,022,785
Operating Lease Liabilities	965,718	1,115,529
Deferred Revenue, Net of Current Portion	851,515	1,339,285
Total Liabilities	7,640,067	8,923,125
Commitments and Contingencies
Stockholders' Equity
Preferred stock, 5,000,000 shares authorized and none issued and outstanding
Common stock, $0.01 par value – 50,000,000 authorized; 16,575,561 issued and 16,502,353 outstanding at June 30, 2020; 16,540,478 issued and 16,485,780 outstanding at December 31, 2019	165,755	165,404
Additional paid-in capital	43,601,105	43,314,123
Treasury stock, 73,208 and 54,698 shares at cost, at June 30, 2020 and December 31, 2019, respectively	(309,901)	(252,570)
Accumulated deficit	(21,387,223)	(15,225,535)
Total Stockholders' Equity	22,069,736	28,001,422
Total Liabilities and Stockholders' Equity	$ 29,709,803	$ 36,924,547