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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income (loss) $ (2,584,320) $ 1,141,255 $ 3,733,707
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation 586,884 436,247 495,347
Amortization 676,528 581,386 373,350
Fair market value adjustment - warrants     (460,289)
Amortization of discounts on investments, net (201,587) (91,485)  
Stock-based compensation 2,910,070 736,066 298,535
Deferred Tax Liability 29,606 1,805 6,166
Loss on disposal of fixed assets 39,251    
Gain on deferred purchase price liability (388,733)    
Changes in operating assets and liabilities:      
Trade accounts receivable 1,042,843 (2,678,746) (1,422,998)
Inventory (609,547) (161,972) (27,082)
Prepaid expenses and other assets (240,861) (525,919) (120,567)
Accounts payable 293,662 (101,801) 1,075,534
Accrued bonus 415,889 475,966 413,051
Accrued liabilities (469,694) 49,591 411,255
Deferred obligation under operating lease (123,477) (117,049) (106,732)
Net cash provided by (used in) operating activities 1,376,514 (254,656) 4,669,277
Cash flows from investing activities:      
Purchases of available-for-sale securities (29,666,317) (21,962,486)  
Maturities of available-for-sale securities 30,991,753 750,000  
Cash paid for acquisition   (6,348,730)  
Purchases of property and equipment (989,866) (263,063) (275,649)
Net cash provided by (used in) investing activities 335,570 (27,824,279) (275,649)
Cash flows from financing activities:      
Repayment of notes payable (1,333,333) (1,388,563) (1,624,999)
Proceeds from initial public offering and issuance of warrants to underwriters     13,600,800
Costs related to initial public offering   781 (2,657,604)
Proceeds from secondary public offering     26,797,094
Costs related to secondary public offering     (820,832)
Payments on acquisition related deferred purchase price (375,000)    
Common stock repurchases (2,174,430) (1,257,100)  
Proceeds from exercise of stock options 765,267 588,482 137,403
Net cash provided by (used in) financing activities (3,117,496) (2,056,400) 35,431,862
Net increase (decrease) in cash and cash equivalents (1,405,412) (30,135,335) 39,825,490
Cash and cash equivalents, beginning of period 15,026,068 45,161,403 5,335,913
Cash and cash equivalents, end of period 13,620,656 15,026,068 45,161,403
Supplemental disclosure of cash flow information      
Interest paid 36,667 98,711 177,460
Taxes paid $ 46,198 $ 102,819  
Supplemental disclosure of non-cash investing and financing activities:      
Accretion of Series E, F, and G preferred redeemable convertible stock to redemption amount     1,356,707
Conversion of warrants     249,215
Conversion of preferred stock into common stock     $ 50,432,162