Liquidity	12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Liquidity	Liquidity The Company has not generated any revenues, including from product sales, and has funded operations primarily from the proceeds of sales of its equity interests and convertible notes, as well as through the Merger. Substantial additional financing will be required by the Company to continue to fund its research and development activities. No assurance can be given that any such financing will be available when needed or that the Company’s research and development efforts will be successful. On July 16, 2018, the Company completed an underwritten public offering (the "July 2018 Offering"), and issued (i) 6,845,000 shares of common stock, (ii) 4,675,000 pre-funded warrants exercisable for shares of common stock and (iii) accompanying common stock warrants to purchase an aggregate of 11,520,000 shares of common stock. The shares of common stock and accompanying common stock warrants were sold at a combined price of $2.10 per share and accompanying common stock warrant. The pre-funded warrants and accompanying common stock warrants were sold at a combined price of $2.0999 per pre-funded warrant and common stock warrant. Each common stock warrant sold with the shares of common stock and pre-funded warrants represents the right to purchase one share of the Company’s common stock at an exercise price of $2.10 per share. The common stock warrants are exercisable immediately and will expire on July 16, 2023, five years from the date of issuance. The pre-funded warrants are exercisable immediately, have an exercise price of $0.0001 per share, and will expire on July 16, 2023, five years from the date of issuance. The net proceeds to the Company from the July 2018 Offering, after deducting the underwriting discounts and commissions and other offering expenses, and excluding the exercise of any warrants, were approximately $21.6 million. In addition to the proceeds from the July 2018 Offering, on March 7, 2018, the Company entered into a securities purchase agreement to issue shares of its Series A convertible preferred stock (“Series A Convertible Preferred”) and warrants to purchase shares of its common stock in a private placement transaction to a select group of institutional investors. The sale of the aggregate 10,700 shares of Series A Convertible Preferred and 5.5 year warrants to acquire an aggregate of 1,383,631 shares of common stock at $6.59 per share was completed in two tranches and resulted in aggregate gross proceeds to the Company of approximately $10.7 million. The Company completed the first tranche for approximately $6.0 million gross proceeds on March 9, 2018. The Company completed the second tranche of the remaining $4.7 million gross proceeds on May 1, 2018, following stockholder approval. The Company regularly explores alternative means of financing its operations and seeks funding through various sources, including public and private securities offerings, collaborative arrangements with third parties and other strategic alliances and business transactions. The Company currently does not have any commitments to obtain additional funds and may be unable to obtain sufficient funding in the future on acceptable terms, if at all. If the Company cannot obtain the necessary funding, it will need to delay, scale back or eliminate some or all of its research and development programs or enter into collaborations with third parties to commercialize potential products or technologies that it might otherwise seek to develop or commercialize independently, consider various other strategic alternatives, including a merger or sale of the Company, or cease operations. If the Company engages in collaborations, it may receive lower consideration upon commercialization of such products than if it had not entered into such arrangements or if it entered into such arrangements at later stages in the product development process. In February 2019, the Company engaged Cantor Fitzgerald & Co. to explore a wide range of strategic alternatives to continue the Company's business plan, with the ultimate objective being an outcome that is in the best interest of the Company's shareholders. Such alternatives may include, but are not limited to, a sale of the Company, a business combination, a merger or reverse merger with another company, a strategic investment into the Company, a sale, license or other disposition of corporate assets, a funded collaboration or partnership, or a financing which would allow the Company to continue with its current business plan of developing its development plans for its lead product candidates. To the extent that this engagement results in a transaction, our business objectives may change depending upon the nature of the transaction. There can be no assurance that we will enter into any transaction as a result of the engagement. The Company has evaluated the guidance of Accounting Standards Codification ("ASC") 205-40, Presentation of Financial Statements - Going Concern, in order to determine whether there is substantial doubt about its ability to continue as a going concern for one year from the date its financial statements are available to be issued. The Company has prepared its consolidated financial statements assuming that it will continue as a going concern, which contemplates realization of assets and the satisfaction of liabilities in the normal course of business. The Company has incurred net losses since inception and it expects to generate losses from operations for the foreseeable future primarily due to research and development costs for its product candidates, which raises substantial doubt about the Company’s ability to continue as a going concern. Various internal and external factors will affect whether and when the Company’s product candidates become approved drugs and how significant their market share will be, some of which are outside of the Company’s control. The length of time and cost of developing and commercializing these product candidates and/or failure of them at any stage of the drug approval process will materially affect the Company’s financial condition and future operations. The consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty. As of December 31, 2018, the Company had cash and cash equivalents of $5.3 million and a restricted cash balance of $0.1 million. In addition, the Company had outstanding accounts payable and accrued expenses of $6.0 million as of December 31, 2018. The Company expects its existing cash as of December 31, 2018, together with the gross proceeds of up to $4.2 million the Company may receive in connection with the exercise of certain warrants to purchase shares of common stock beginning in March 2019, pursuant to a warrant exercise agreement, will enable the Company to fund its operating expenses through June 2019. In the event that not all of the warrants subject to the warrant exercise agreement are exercised, the Company will need to raise additional capital earlier than anticipated to fund our operations.

Liquidity

The Company has not generated any revenues, including from product sales, and has funded operations primarily from the proceeds of sales of its equity interests and convertible notes, as well as through the Merger. Substantial additional financing will be required by the Company to continue to fund its research and development activities. No assurance can be given that any such financing will be available when needed or that the Company’s research and development efforts will be successful.

On July 16, 2018, the Company completed an underwritten public offering (the "July 2018 Offering"), and issued (i) 6,845,000 shares of common stock, (ii) 4,675,000 pre-funded warrants exercisable for shares of common stock and (iii) accompanying common stock warrants to purchase an aggregate of 11,520,000 shares of common stock. The shares of common stock and accompanying common stock warrants were sold at a combined price of $2.10 per share and accompanying common stock warrant. The pre-funded warrants and accompanying common stock warrants were sold at a combined price of $2.0999 per pre-funded warrant and common stock warrant. Each common stock warrant sold with the shares of common stock and pre-funded warrants represents the right to purchase one share of the Company’s common stock at an exercise price of $2.10 per share. The common stock warrants are exercisable immediately and will expire on July 16, 2023, five years from the date of issuance. The pre-funded warrants are exercisable immediately, have an exercise price of $0.0001 per share, and will expire on July 16, 2023, five years from the date of issuance. The net proceeds to the Company from the July 2018 Offering, after deducting the underwriting discounts and commissions and other offering expenses, and excluding the exercise of any warrants, were approximately $21.6 million.

In addition to the proceeds from the July 2018 Offering, on March 7, 2018, the Company entered into a securities purchase agreement to issue shares of its Series A convertible preferred stock (“Series A Convertible Preferred”) and warrants to purchase shares of its common stock in a private placement transaction to a select group of institutional investors. The sale of the aggregate 10,700 shares of Series A Convertible Preferred and 5.5 year warrants to acquire an aggregate of 1,383,631 shares of common stock at $6.59 per share was completed in two tranches and resulted in aggregate gross proceeds to the Company of approximately $10.7 million. The Company completed the first tranche for approximately $6.0 million gross proceeds on March 9, 2018. The Company completed the second tranche of the remaining $4.7 million gross proceeds on May 1, 2018, following stockholder approval.

The Company regularly explores alternative means of financing its operations and seeks funding through various sources, including public and private securities offerings, collaborative arrangements with third parties and other strategic alliances and business transactions.

The Company currently does not have any commitments to obtain additional funds and may be unable to obtain sufficient funding in the future on acceptable terms, if at all. If the Company cannot obtain the necessary funding, it will need to delay, scale back or eliminate some or all of its research and development programs or enter into collaborations with third parties to commercialize potential products or technologies that it might otherwise seek to develop or commercialize independently, consider various other strategic alternatives, including a merger or sale of the Company, or cease operations. If the Company engages in collaborations, it may receive lower consideration upon commercialization of such products than if it had not entered into such arrangements or if it entered into such arrangements at later stages in the product development process.

In February 2019, the Company engaged Cantor Fitzgerald & Co. to explore a wide range of strategic alternatives to continue the Company's business plan, with the ultimate objective being an outcome that is in the best interest of the Company's shareholders. Such alternatives may include, but are not limited to, a sale of the Company, a business combination, a merger or reverse merger with another company, a strategic investment into the Company, a sale, license or other disposition of corporate assets, a funded collaboration or partnership, or a financing which would allow the Company to continue with its current business plan of developing its development plans for its lead product candidates. To the extent that this engagement results in a transaction, our business objectives may change depending upon the nature of the transaction. There can be no assurance that we will enter into any transaction as a result of the engagement.

The Company has evaluated the guidance of Accounting Standards Codification ("ASC") 205-40, Presentation of Financial Statements - Going Concern, in order to determine whether there is substantial doubt about its ability to continue as a going concern for one year from the date its financial statements are available to be issued. The Company has prepared its consolidated financial statements assuming that it will continue as a going concern, which contemplates realization of assets and the satisfaction of liabilities in the normal course of business. The Company has incurred net losses since inception and it expects to generate losses from operations for the foreseeable future primarily due to research and development costs for its product candidates, which raises substantial doubt about the Company’s ability to continue as a going concern. Various internal and external factors will affect whether and when the Company’s product candidates become approved drugs and how significant their market share will be, some of which are outside of the Company’s control. The length of time and cost of developing and commercializing these product candidates and/or failure of them at any stage of the drug approval process will materially affect the Company’s financial condition and future operations. The consolidated financial statements do not include any adjustments relating to the recoverability and classification of recorded asset amounts or the amounts and classification of liabilities that might result from the outcome of this uncertainty.

As of December 31, 2018, the Company had cash and cash equivalents of $5.3 million and a restricted cash balance of $0.1 million. In addition, the Company had outstanding accounts payable and accrued expenses of $6.0 million as of December 31, 2018. The Company expects its existing cash as of December 31, 2018, together with the gross proceeds of up to $4.2 million the Company may receive in connection with the exercise of certain warrants to purchase shares of common stock beginning in March 2019, pursuant to a warrant exercise agreement, will enable the Company to fund its operating expenses through June 2019. In the event that not all of the warrants subject to the warrant exercise agreement are exercised, the Company will need to raise additional capital earlier than anticipated to fund our operations.