Common Stock Warrants	9 Months Ended
Sep. 30, 2018
Warrants and Rights Note Disclosure [Abstract]
Common Stock Warrants	Note 7 — Common Stock Warrants In May 2017, the Company issued a warrant to purchase 600,000 shares of its common stock to consultants for business strategy and intellectual property advisory services. The warrant vested at issuance in May 2017 and has a $0.01 exercise price per warrant share and expires five years from the date of issuance. The Company used the BSM to value the warrant and the fair value at the date of issuance was $121 based on an expected term of five years, volatility of 85%, a risk-free interest rate of 1.8% and a 0% rate on expected dividends. The $121 amount for the consulting warrants was expensed as a component of the Company’s general and administrative expenses in May 2017. In conjunction with the closing of the Series A Preferred offering in June 2017 (See Note 5), the Company issued a warrant to purchase 649,409 shares of its common stock to the placement agent at an exercise price of $3.00 per share, provided, however, upon the conversion of the Series A Preferred, the warrant shall adjust to entitle the holder to purchase shares of common stock equal to 10.0% of the shares of common stock issuable upon conversion of the Series A Preferred (excluding 191,000 shares of Series A Preferred that were purchased by insiders) and the exercise price shall adjust to the conversion price of the Series A Preferred. This warrant vested at issuance in June 2017. The Company used the BSM to value the warrant and the fair value at the date of issuance was $479. The number of common shares issuable upon the exercise of this warrant was not fixed as it could vary by a factor of 1.000 to 1.333 common shares per warrant share in accordance with the IPO price, and the Company considered the warrant to be a derivative instrument. The $479 amount was recorded as a component of the issuance costs for the Series A Preferred in June 2017. As of December 31, 2017, the fair value of the warrant was $520 and the $41 increase in value during 2017 was recorded as a component of other income and expense. As of September 30, 2018, the fair value of the warrants was $1,577 and the $1,057 increase in value during 2018 was recorded as a component of other income and expense. The fair value assumptions included an expected term of five years, expected volatility of 85%, a risk-free interest rate of 2.9% and estimate of the conversion rate. These warrants are classified as warrant liability on the Company’s balance sheets. In accordance with the Company’s IPO in November 2018, the number of shares issuable upon the exercise of these warrants became fixed which eliminates the fair value adjustment after that date. The weighted average exercise price of the outstanding warrants for the consultant and placement agent as of both December 31, 2017 and September 30, 2018 was $1.56 per share. The holders of these warrants or their permitted transferees, are entitled to rights with respect to the registration under the Securities Act of their shares that are converted to common stock, including demand registration rights and piggyback registration rights. These rights are provided under the terms of a registration rights agreement between the Company and the investors.

Common Stock Warrants

9 Months Ended

Sep. 30, 2018

Warrants and Rights Note Disclosure [Abstract]

Note 7 — Common Stock Warrants

In May 2017, the Company issued a warrant to purchase 600,000 shares of its common stock to consultants for business strategy and intellectual property advisory services. The warrant vested at issuance in May 2017 and has a $0.01 exercise price per warrant share and expires five years from the date of issuance. The Company used the BSM to value the warrant and the fair value at the date of issuance was $121 based on an expected term of five years, volatility of 85%, a risk-free interest rate of 1.8% and a 0% rate on expected dividends. The $121 amount for the consulting warrants was expensed as a component of the Company’s general and administrative expenses in May 2017.

In conjunction with the closing of the Series A Preferred offering in June 2017 (See Note 5), the Company issued a warrant to purchase 649,409 shares of its common stock to the placement agent at an exercise price of $3.00 per share, provided, however, upon the conversion of the Series A Preferred, the warrant shall adjust to entitle the holder to purchase shares of common stock equal to 10.0% of the shares of common stock issuable upon conversion of the Series A Preferred (excluding 191,000 shares of Series A Preferred that were purchased by insiders) and the exercise price shall adjust to the conversion price of the Series A Preferred. This warrant vested at issuance in June 2017. The Company used the BSM to value the warrant and the fair value at the date of issuance was $479. The number of common shares issuable upon the exercise of this warrant was not fixed as it could vary by a factor of 1.000 to 1.333 common shares per warrant share in accordance with the IPO price, and the Company considered the warrant to be a derivative instrument. The $479 amount was recorded as a component of the issuance costs for the Series A Preferred in June 2017. As of December 31, 2017, the fair value of the warrant was $520 and the $41 increase in value during 2017 was recorded as a component of other income and expense.

As of September 30, 2018, the fair value of the warrants was $1,577 and the $1,057 increase in value during 2018 was recorded as a component of other income and expense. The fair value assumptions included an expected term of five years, expected volatility of 85%, a risk-free interest rate of 2.9% and estimate of the conversion rate. These warrants are classified as warrant liability on the Company’s balance sheets. In accordance with the Company’s IPO in November 2018, the number of shares issuable upon the exercise of these warrants became fixed which eliminates the fair value adjustment after that date.

The weighted average exercise price of the outstanding warrants for the consultant and placement agent as of both December 31, 2017 and September 30, 2018 was $1.56 per share.

The holders of these warrants or their permitted transferees, are entitled to rights with respect to the registration under the Securities Act of their shares that are converted to common stock, including demand registration rights and piggyback registration rights. These rights are provided under the terms of a registration rights agreement between the Company and the investors.