Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net loss	$ (1,932,798)	$ (1,606,026)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	99,125	103,405
Non-cash equity based compensation	73,361	61,564
Change in operating assets and liabilities:
Accounts receivable	(522,799)	686,434
Inventories	(539,312)	(349,289)
Prepaid expenses and other current assets	(106,925)	(4,543)
Accounts payable and other current liabilities	224,776	75,390
Unearned revenue	1,672,926	23,344
Billings in excess of costs and estimated earnings on engineering services contracts	165,790	17,565
Other long-term liabilities	(5,000)	(5,000)
Net cash used in operating activities	(870,856)	(997,156)
Cash flows from investing activities:
Acquisition of property and equipment, net	(32,220)	(11,094)
Cash paid for patent and trademark fees	(13,823)	(5,339)
Net cash used in investing activities	(46,043)	(16,433)
Cash flows from financing activities:
Cash received for shares exercised under employee stock purchase plan	17,957	1,950
Borrowings on line of credit		600,000
Net cash provided by financing activities	17,957	601,950
Decrease in cash, cash equivalents, and restricted cash	(898,942)	(411,639)
Cash, cash equivalents, and restricted cash at beginning of period	6,809,325	2,100,089
Cash, cash equivalents, and restricted cash at end of period	$ 5,910,383	$ 1,688,450