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Unaudited Condensed Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 549,323 $ 2,633,405
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation 336,817 357,425
Amortization 396,206 276,004
Fair market value adjustment - warrants   (460,289)
Amortization of discounts on investments, net (23,683)  
Stock-based compensation 463,856 224,039
Deferred tax liability 67,709  
Changes in operating assets and liabilities:    
Trade accounts receivable (1,969,507) (2,034,467)
Inventory (30,265) 14,714
Prepaid expenses and other assets (501,506) (214,574)
Accounts payable (123,112) 1,309,924
Accrued bonus (83,140) (193,257)
Accrued liabilities 16,143 135,046
Deferred obligation under operating lease (92,216) (80,049)
Net cash provided by (used in) operating activities (993,375) 1,967,921
Cash flows from investing activities:    
Purchases of available-for-sale securities (18,441,161)  
Cash paid for acquisition (6,348,730)  
Purchases of property and equipment (195,922) (275,649)
Net cash used in investing activities (24,985,813) (275,649)
Cash flows from financing activities:    
Repayment of notes payable (1,055,230) (1,216,928)
Proceeds from initial public offering   13,600,800
Costs related to initial public offering 781 (2,697,853)
Common stock repurchases (468,823)  
Proceeds from exercise of stock options 506,704 112,100
Net cash provided by (used in) financing activities (1,016,568) 9,798,119
Net increase (decrease) in cash and cash equivalents (26,995,756) 11,490,391
Cash and cash equivalents, beginning of period 45,161,403 5,335,913
Cash and cash equivalents, end of period 18,165,647 16,826,304
Supplemental disclosure of cash flow information    
Interest paid 85,085 141,505
Taxes paid $ 114,639  
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   50,432,161
Issuance of warrants to underwriters in connection with initial public offering   $ 126,218