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Unaudited Condensed Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net income $ 385,090 $ 139,153
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation 115,447 117,445
Amortization 97,346 91,333
Fair market value adjustment - warrants   (78,834)
Stock-based compensation 73,475 28,893
Deferred tax liability 9,834  
Changes in operating assets and liabilities:    
Trade accounts receivable (2,357,941) 52,995
Inventory 38,494 73,048
Prepaid expenses and other assets (75,203) 83,248
Accounts payable 42,917 (349,102)
Accrued bonus (1,149,076) (937,250)
Accrued liabilities (268,306) (47,302)
Deferred obligation under operating lease (30,739) (26,683)
Net cash used in operating activities (3,118,662) (853,056)
Cash flows from investing activities:    
Purchases of property and equipment (119,312) (41,030)
Net cash used in investing activities (119,312) (41,030)
Cash flows from financing activities:    
Repayment of notes payable (388,563) (404,469)
Reversal of costs related to initial public offering 781  
Proceeds from exercise of stock options 323,651  
Net cash used in financing activities (64,131) (404,469)
Net decrease in cash and cash equivalents (3,302,105) (1,298,555)
Cash and cash equivalents, beginning of period 45,161,403 5,335,913
Cash and cash equivalents, end of period 41,859,298 4,037,358
Supplemental disclosure of cash flow information    
Interest paid 32,508 52,475
Supplemental disclosure of non-cash investing and financing activities:    
Accretion of Series E, F, and G preferred redeemable convertible stock to redemption amount   $ 533,203
Accrual of property and equipment $ 1,054