CONDENSED STATEMENTS OF CASH FLOWS - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income	$ 5,125,214	$ 1,779,545
Adjustments to reconcile net income to net cash provided by operating activities:
Bad debt expense	15,728	37,368
Provision for excess and obsolete inventory	103,471	36,709
Depreciation and amortization	163,709	99,638
Stock-based compensation	913,234	503,881
Impairment of intangible assets	55,433
Changes in operating assets and liabilities:
Accounts receivable	(1,483,730)	770,612
Inventory	(236,923)	(336,355)
Prepaid expenses and other current assets	(80,182)	(126,434)
Other assets	(22,589)	(17,498)
Deferred income taxes	(93,858)	(189,235)
Accounts payable	287,715	212,761
Accrued payroll and benefits	(109,934)	263,682
Other accrued taxes	(42,495)	(40,403)
Warranty reserve	35,155	3,669
Deferred revenue	347,442	238,367
Accrued income taxes, net of prepaid income taxes	105,220	249,343
Other		1,461
Net cash provided by operating activities	5,082,610	3,487,111
Investing activities:
Purchases of investments		(3,011)
Proceeds from sale of investments		255,109
Purchases of property and equipment	(193,368)	(504,502)
Capitalized intangible assets	(13,110)	(21,726)
Net cash used in investing activities	(206,478)	(274,130)
Financing activities:
Proceeds from stock option exercises	320,807
Income tax benefits credited to equity	878,146
Proceeds from the issuance of common stock pursuant to initial public offering		14,490,000
Payment of initial public offering costs		(2,044,348)
Repayment of officer note payable		(6,333)
Net cash provided by financing activities	1,198,953	12,439,319
Net increase in cash and cash equivalents	6,075,085	15,652,300
Cash and cash equivalents, beginning of period	9,454,150	2,461,559
Cash and cash equivalents, end of period	15,529,235	18,113,859
Supplemental disclosure of cash flow information:
Cash paid for income taxes	$ 2,402,000	$ 1,004,574