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Statements of Stockholders' Equity (Deficit) - USD ($) | Total | Preferred Convertible Stock | Common Stock | Additional Paid-in Capital | Treasury Stock | Note to Employee | Accumulated Deficit | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 | $ (37,670,138) | $ 5,968,549 | $ 1,017,003 |  |  | $ (266,282) | $ (44,389,408) |
Beginning balance, shares at Dec. 31, 2014 |  | 6,244,174 | 625,282 |  |  |  |  |
Stock-based compensation | 341,554 |  |  | $ 341,554 |  |  |  |
Shares issued pursuant to stock awards, shares |  |  | 16,300 |  |  |  |  |
Exercise of stock options | $ 77,372 |  | $ 77,372 |  |  |  |  |
Exercise of stock options, shares | 24,260 |  | 24,260 |  |  |  |  |
Change in note to employee | $ 266,282 |  |  |  |  | $ 266,282 |  |
Effect of accretion to redemption value | (2,157,550) |  |  | (341,554) |  |  | (1,815,996) |
Net income (loss) | (270,342) |  |  |  |  |  | (270,342) |
Ending balance at Dec. 31, 2015 | (39,412,822) | $ 5,968,549 | $ 1,094,375 |  |  |  | (46,475,746) |
Ending balance, shares at Dec. 31, 2015 |  | 6,244,174 | 665,842 |  |  |  |  |
Stock-based compensation | 298,535 |  |  | 298,535 |  |  |  |
Conversion of warrants | 249,215 |  |  | 249,215 |  |  |  |
Conversion of warrants, shares |  |  | 127,143 |  |  |  |  |
Exercise of stock options | $ 137,403 |  | $ 112,101 | 25,302 |  |  |  |
Exercise of stock options, shares | 58,155 |  | 58,155 |  |  |  |  |
Effect of accretion to redemption value | $ (1,356,707) |  |  | (547,750) |  |  | (808,957) |
Change in par value from no par value to $0.0001 |  |  | $ (1,206,391) | 1,206,391 |  |  |  |
Issuance of common stock upon initial public offering, net of issuance costs | 10,816,978 |  | $ 170 | 10,816,808 |  |  |  |
Issuance of common stock upon initial public offering, net of issuance costs, shares |  |  | 1,700,100 |  |  |  |  |
Issuance of warrants to underwriters | 126,218 |  |  | 126,218 |  |  |  |
Conversion of preferred redeemable convertible stock to common stock upon initial public offering | 44,463,613 |  | $ 378 | 44,463,235 |  |  |  |
Conversion of preferred redeemable convertible stock to common stock upon initial public offering, shares |  |  | 3,778,753 |  |  |  |  |
Conversion of preferred convertible stock to common stock upon initial public offering |  | $ (5,968,549) | $ 126 | 5,968,423 |  |  |  |
Conversion of preferred convertible stock to common stock upon initial public offering, shares |  | (6,244,174) | 1,259,187 |  |  |  |  |
Issuance of common stock upon secondary public offering, net of issuance costs | 25,976,262 |  | $ 169 | 25,976,093 |  |  |  |
Issuance of common stock upon secondary public offering, net of issuance costs, shares |  |  | 1,685,882 |  |  |  |  |
Net income (loss) | 3,733,707 |  |  |  |  |  | 3,733,707 |
Ending balance at Dec. 31, 2016 | 45,032,402 |  | $ 928 | 88,582,470 |  |  | (43,550,996) |
Ending balance, shares at Dec. 31, 2016 |  |  | 9,275,062 |  |  |  |  |
Stock-based compensation | 736,066 |  |  | 736,066 |  |  |  |
Shares issued pursuant to stock awards |  |  | $ 5 | (5) |  |  |  |
Shares issued pursuant to stock awards, shares |  |  | 57,475 |  |  |  |  |
Exercise of stock options | $ 588,482 |  | $ 28 | 588,454 |  |  |  |
Exercise of stock options, shares | 284,455 |  | 284,455 |  |  |  |  |
Common stock repurchases | $ (1,257,100) |  |  |  | $ (1,257,100) |  |  |
Common stock repurchases, shares |  |  | (135,000) |  |  |  |  |
Reversal of costs related to secondary offering | 781 |  |  | 781 |  |  |  |
Unrealized loss on available-for-sale securities | (16,907) |  |  |  |  |  |  | $ (16,907)
Net income (loss) | 1,141,255 |  |  |  |  |  | 1,141,255 |
Ending balance at Dec. 31, 2017 | $ 46,224,979 |  | $ 961 | $ 89,907,766 | $ (1,257,100) |  | $ (42,409,741) | $ (16,907)
Ending balance, shares at Dec. 31, 2017 |  |  | 9,481,992 |  |  |  |  |

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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