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Equity - Narrative (Details) |  |  |  |  |  | 1 Months Ended | 4 Months Ended | 12 Months Ended |  |
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Sep. 15, 2017 USD ($) | Jul. 29, 2017 warrant $ / shares shares | Feb. 21, 2017 USD ($) | Jun. 20, 2016 USD ($) shares | May 31, 2016 USD ($) $ / shares shares | Feb. 28, 2017 USD ($) $ / shares shares | Jan. 31, 2017 shares | Oct. 31, 2016 shares | May 02, 2016 USD ($) shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Feb. 09, 2017 $ / shares | Apr. 22, 2016 shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  |  |  |  |  |  | 80,000,000 |  |  |  |
Preferred stock, shares authorized |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 | 5,000,000 |  |
Common stock, shares authorized |  |  |  |  |  |  |  |  | 75,000,000 | 75,000,000 | 75,000,000 |  |
Preferred stock, shares issued |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 1.35 | $ 3.00 |  |
Proceeds from issuance, IPO | $ |  |  |  |  |  |  |  |  |  | $ 6,071,000 | $ 9,170,000 |  |
Shares of common stock issued |  |  |  |  |  |  |  |  | 234,297 |  |  |  |
Warrants to purchase common stock |  |  |  |  | 107,802 |  |  |  |  |  |  |  |
Warrants exercisable period |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Warrants, exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 7.50 |  |  |  |  |  |  |  |
Volatility (as a percent) |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Value of cash subscriptions to be received | $ |  |  |  |  |  |  |  |  | $ 702,894 |  |  |  |
Aggregate fair value of options granted | $ |  |  |  |  |  |  |  |  |  | $ 1,400,000 |  |  |
Unrecognized compensation cost, net of estimated forfeitures | $ |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  |  |
Compensation cost recognized, weighted average period (in years) |  |  |  |  |  |  |  |  |  | 8 years 8 months 12 days |  |  |
Aggregate fair value of options | $ |  |  |  |  |  |  |  |  |  | $ 3,100,000 | $ 1,800,000 |  |
Options exercised |  |  |  |  |  |  |  |  |  | 0 | 0 |  |
Number of shares cancelled |  |  |  |  |  |  |  |  |  | 0 | 150,000 |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 1.50 |
Expected life (in years) |  |  |  |  |  |  |  |  |  | 6 years 3 months | 6 years 3 months |  |
Volatility (as a percent) |  |  |  |  |  |  |  |  |  |  | 70.44% |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 1.35 |
Expected life (in years) |  |  |  |  |  |  |  |  |  | 5 years | 6 years |  |
Volatility (as a percent) |  |  |  |  |  |  |  |  |  |  | 70.18% |  |
PCG Advisory Group |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued |  |  |  | 24,000 |  |  |  |  |  |  |  |  |
Value of cash subscriptions to be received | $ |  |  |  | $ 157,680 |  |  |  |  |  |  |  |  |
Warrant |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants | $ |  |  |  |  | $ 374,763 |  |  |  |  |  |  |  |
Discount rate |  |  |  |  | 1.39% |  |  |  |  |  |  |  |
Expected life (in years) |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Volatility (as a percent) |  |  |  |  | 80.61% |  |  |  |  |  |  |  |
Expected dividends | $ |  |  |  |  | $ 0 |  |  |  |  |  |  |  |
GSK Consulting Agreement Warrant One |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  | 100,000 |  |  |  |  |  |  |  |  |  |  |
Warrants, exercise price (in dollars per share) | $ / shares |  | $ 2.41 |  |  |  |  |  |  |  |  |  |  |
Number of warrants issued | warrant |  | 2 |  |  |  |  |  |  |  |  |  |  |
GSK Consulting Agreement Warrant Two |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to purchase common stock |  | 50,000 |  |  |  |  |  |  |  |  |  |  |
Warrants, exercise price (in dollars per share) | $ / shares |  | $ 3.00 |  |  |  |  |  |  |  |  |  |  |
The Warrants |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement period |  | 12 months |  |  |  |  |  |  |  |  |  |  |
Warrant vesting period (in months) |  | 12 months |  |  |  |  |  |  |  |  |  |  |
Expiration period of warrants |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense for non-employee consulting agreement | $ |  |  |  |  |  |  |  |  |  | $ 104,000 |  |  |
IPO |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units issued |  |  |  |  |  | 3,710,000 |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  |  |  | $ 6.00 | $ 1.35 |  |  |  |  |  |  |
Proceeds from issuance, IPO | $ |  |  |  |  | $ 8,464,183 | $ 4,500,000 |  |  |  |  |  |  |
Shares of common stock issued |  |  |  |  | 1,540,026 |  |  |  |  |  |  |  |
At Market Issuance Sales Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Commission payment to agents (as a percent) | 3.00% |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of common stock | $ |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |
2015 Stock Plan |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total number of underlying shares under 2015 Stock Plan |  |  |  |  |  |  |  |  |  |  |  |  | 2,500,000
Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued for services |  |  |  |  |  |  |  |  |  | 79,167 | 24,000 |  |
Common Stock | At Market Issuance Sales Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock sold |  |  |  |  |  |  |  |  |  | 776,016 |  |  |
Common Stock | At Market Issuance Sales Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 2.71 |  |  |
Common Stock | At Market Issuance Sales Agreement | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued, price per share (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  | $ 2.05 |  |  |
Common Stock | Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares cancelled |  |  |  |  |  |  |  | 150,000 |  |  |  |  |
Number of remaining options accelerated for vesting |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
Common Stock | Roth Capital Partners, LLC and National Securities Corporation | At Market Issuance Sales Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate price of shares issued | $ | $ 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Former Science Advisory Board |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Shares of common stock issued for services |  |  |  |  |  |  | 79,167 |  |  |  |  |  |
Gain on settlement of liability | $ |  |  | $ 150,000 |  |  |  |  |  |  |  |  |  |
Obligation recorded from settlement of liability | $ |  |  |  |  |  |  |  |  |  |  | $ 240,000 |  |

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