Unaudited Condensed Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income (loss)	$ (3,858,879)	$ 549,323
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation	422,549	336,817
Amortization	508,038	396,206
Amortization of discounts on investments, net	(94,317)	(23,683)
Stock-based compensation	2,536,132	463,856
Deferred tax liability	21,916	67,709
Gain on deferred purchase price liability	(388,733)
Changes in operating assets and liabilities:
Trade accounts receivable	667,375	(1,969,507)
Inventory	(476,274)	(30,265)
Prepaid expenses and other assets	(255,654)	(501,506)
Accounts payable	35,954	(123,112)
Accrued bonus	154,288	(83,140)
Accrued liabilities	(425,351)	16,143
Deferred obligation under operating lease	(87,703)	(92,216)
Net cash used in operating activities	(1,240,659)	(993,375)
Cash flows from investing activities:
Cash paid for acquisition		(6,348,730)
Purchases of available-for-sale securities	(24,328,831)	(18,441,161)
Maturities of available-for-sale securities	26,955,449
Purchases of property and equipment	(751,998)	(195,922)
Net cash provided by (used in) investing activities	1,874,620	(24,985,813)
Cash flows from financing activities:
Repayment of notes payable	(1,000,000)	(1,055,230)
Payment on deferred purchase price liability	(375,000)
Reversal of costs related to initial public offering		781
Common stock repurchases	(1,836,874)	(468,823)
Proceeds from exercise of stock options	616,501	506,704
Net cash used in financing activities	(2,595,373)	(1,016,568)
Net decrease in cash and cash equivalents	(1,961,412)	(26,995,756)
Cash and cash equivalents, beginning of period	15,026,068	45,161,403
Cash and cash equivalents, end of period	13,064,656	18,165,647
Supplemental disclosure of cash flow information
Interest paid	33,812	85,085
Taxes paid	$ 26,026	$ 114,639