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Statements of Changes in Stockholders’ Equity - USD ($) | Total | Series A Convertible Preferred Stock [Member] | Series A-2 Convertible Preferred Stock [Member] | Series B Convertible Preferred Stock [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 |  | $ 2,398,496 | $ 323 | $ 0 | $ 0 | $ 227 | $ 12,995,702 | $ (10,597,756)
Balance (in shares) at Dec. 31, 2015 |  |  | 3,232,294 | 0 | 0 | 2,266,667 |  |
Stock-based compensation |  | 2,690 | $ 0 | $ 0 | $ 0 | $ 0 | 2,690 | 0
Issuance convertible preferred stock, net of issuance costs |  | 4,141,338 | $ 0 | $ 79 | $ 0 | $ 0 | 4,141,259 | 0
Issuance convertible preferred stock, net of issuance costs (in shares) |  |  | 0 | 788,827 | 0 | 0 |  |
Net loss |  | (3,533,443) | $ 0 | $ 0 | $ 0 | $ 0 | 0 | (3,533,443)
Balance at Dec. 31, 2016 |  | 3,009,081 | $ 323 | $ 79 | $ 0 | $ 227 | 17,139,651 | (14,131,199)
Balance (in shares) at Dec. 31, 2016 |  |  | 3,232,294 | 788,827 | 0 | 2,266,667 |  |
Issuance of warrant |  | 431,574 | $ 0 | $ 0 | $ 0 | $ 0 | 431,574 | 0
Stock-based compensation |  | 412,312 | 0 | 0 | 0 | 0 | 412,312 | 0
Issuance convertible preferred stock, net of issuance costs | [1] | 6,367,693 | $ 0 | $ 0 | $ 92 | $ 0 | 6,367,601 | 0
Issuance convertible preferred stock, net of issuance costs (in shares) | [1] |  | 0 | 0 | 918,983 | 0 |  |
Conversion of Series A convertible preferred stock into common stock |  | 0 | $ (30) | $ 0 | $ 0 | $ 30 | 0 | 0
Conversion of Series A convertible preferred stock into common stock (in shares) |  |  | (299,863) | 0 | 0 | 299,863 |  |
Net loss |  | (5,129,987) | $ 0 | $ 0 | $ 0 | $ 0 | 0 | (5,129,987)
Balance at Dec. 31, 2017 |  | $ 5,090,673 | $ 293 | $ 79 | $ 92 | $ 257 | $ 24,351,138 | $ (19,261,186)
Balance (in shares) at Dec. 31, 2017 |  |  | 2,932,431 | 788,827 | 918,983 | 2,566,530 |  |
[1] | Includes gross proceeds of $6,409,651, less issuance costs of $41,958.

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