Commitments and Contingencies	12 Months Ended
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Federal Securities Litigation On January 31, 2017, a putative class action complaint was filed by Baran Polat in the United States District Court for the Southern District of California (“District Court”) against the Company, its then-Chief Executive Officer Paul C. Grint, and its then-Chief Operating Officer Joseph P. Hagan (currently the Company’s Chief Executive Officer). The complaint includes claims asserted, on behalf of certain purchasers of the Company’s securities, under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended. In general, the complaint alleges that, between January 21, 2016, and June 27, 2016, the defendants violated the federal securities laws by making materially false and misleading statements regarding the Company’s business and the prospects for RG-101, thereby artificially inflating the price of the Company’s securities. The plaintiff seeks unspecified monetary damages and other relief. On February 10, 2017, a second putative class action complaint was filed by Li Jin in the District Court against the Company, Mr. Hagan, Dr. Grint, and Timothy Wright, the Company’s Chief Research and Development Officer. The Complaint alleges claims similar to those asserted by Mr. Polat. The actions have been related. On February 17, 2017, the District Court entered an order stating that defendants need not answer, or otherwise respond, until the District Court enters an order appointing, pursuant to the Private Securities Litigation Reform Act of 1995, lead plaintiff and lead counsel, and the parties then submit a schedule to the District Court for the filing of an amended or consolidated complaint and the timing of defendants’ answer or response. On April 3, 2017, two motions for consolidation of the two actions, appointment of lead plaintiff, and approval of counsel were filed in the action (“Motions to Consolidate”). On October 26, 2017, the District Court entered an order consolidating the cases, appointing Mark Appel and Michael Spitters to serve as co-lead plaintiffs, and appointing Levi & Korsinsky LLP to serve as lead counsel. On December 22, 2017, lead plaintiffs filed a consolidated complaint against the Company, Dr. Grint, Mr. Hagan, and Michael Huang (the Company’s former Vice President of Clinical Development). The consolidated complaint alleges that between February 17, 2016 and June 12, 2017, the defendants violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, by making materially false and misleading statements regarding RG-101. The consolidated complaint seeks unspecified monetary damages and an award of attorneys’ fees and costs. On February 6, 2018, the defendants filed a motion to dismiss the consolidated complaint. On March 23, 2018, lead plaintiffs filed their opposition to the motion to dismiss. On April 24, 2018, the defendants filed their reply in support of the motion to dismiss. On September 5, 2019, the court granted defendants’ motion to dismiss with leave to amend. Plaintiffs filed their amended complaint on October 1, 2019. Subsequent to the filing of the amended complaint, counsel for the parties engaged in negotiations to resolve the case. On November 4, 2019, the parties agreed in principle to settle the case for $0.9 million, with approximately $0.3 million to be paid by us and the balance to be paid by our D&O insurance carrier. On December 11, 2019, the parties entered into a stipulation and agreement of settlement, which was amended on February 6, 2020. On February 7, 2020, plaintiffs filed a motion for preliminary approval of the settlement. The settlement is contingent upon court approval. In connection with the proposed settlement and in accordance with authoritative guidance, we recorded the $0.9 million loss contingency as a current liability on our balance sheet at December 31, 2019, and recorded the $0.6 million of expected insurance proceeds from our D&O insurance carrier as a current receivable on our balance sheet at December 31, 2019. The $0.3 million settlement amount payable by the Company was recorded to the statement of operations and comprehensive loss for the year ended December 31, 2019. The settlement is contingent upon both the parties’ entry into a definitive settlement agreement and court approval. License Agreements We have license agreements with third parties that require us to make annual license maintenance payments and future payments upon the success of licensed products that include milestones and/or royalties. Minimum future payments over the next five years are not material.

Commitments and Contingencies

Federal Securities Litigation

On January 31, 2017, a putative class action complaint was filed by Baran Polat in the United States District Court for the Southern District of California (“District Court”) against the Company, its then-Chief Executive Officer Paul C. Grint, and its then-Chief Operating Officer Joseph P. Hagan (currently the Company’s Chief Executive Officer). The complaint includes claims asserted, on behalf of certain purchasers of the Company’s securities, under Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended. In general, the complaint alleges that, between January 21, 2016, and June 27, 2016, the defendants violated the federal securities laws by making materially false and misleading statements regarding the Company’s business and the prospects for RG-101, thereby artificially inflating the price of the Company’s securities. The plaintiff seeks unspecified monetary damages and other relief. On February 10, 2017, a second putative class action complaint was filed by Li Jin in the District Court against the Company, Mr. Hagan, Dr. Grint, and Timothy Wright, the Company’s Chief Research and Development Officer. The Complaint alleges claims similar to those asserted by Mr. Polat. The actions have been related. On February 17, 2017, the District Court entered an order stating that defendants need not answer, or otherwise respond, until the District Court enters an order appointing, pursuant to the Private Securities Litigation Reform Act of 1995, lead plaintiff and lead counsel, and the parties then submit a schedule to the District Court for the filing of an amended or consolidated complaint and the timing of defendants’ answer or response. On April 3, 2017, two motions for consolidation of the two actions, appointment of lead plaintiff, and approval of counsel were filed in the action (“Motions to Consolidate”). On October 26, 2017, the District Court entered an order consolidating the cases, appointing Mark Appel and Michael Spitters to serve as co-lead plaintiffs, and appointing Levi & Korsinsky LLP to serve as lead counsel. On December 22, 2017, lead plaintiffs filed a consolidated complaint against the Company, Dr. Grint, Mr. Hagan, and Michael Huang (the Company’s former Vice President of Clinical Development). The consolidated complaint alleges that between February 17, 2016 and June 12, 2017, the defendants violated Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, by making materially false and misleading statements regarding RG-101. The consolidated complaint seeks unspecified monetary damages and an award of attorneys’ fees and costs. On February 6, 2018, the defendants filed a motion to dismiss the consolidated complaint. On March 23, 2018, lead plaintiffs filed their opposition to the motion to dismiss. On April 24, 2018, the defendants filed their reply in support of the motion to dismiss. On September 5, 2019, the court granted defendants’ motion to dismiss with leave to amend. Plaintiffs filed their amended complaint on October 1, 2019. Subsequent to the filing of the amended complaint, counsel for the parties engaged in negotiations to resolve the case. On November 4, 2019, the parties agreed in principle to settle the case for $0.9 million, with approximately $0.3 million to be paid by us and the balance to be paid by our D&O insurance carrier. On December 11, 2019, the parties entered into a stipulation and agreement of settlement, which was amended on February 6, 2020. On February 7, 2020, plaintiffs filed a motion for preliminary approval of the settlement. The settlement is contingent upon court approval. In connection with the proposed settlement and in accordance with authoritative guidance, we recorded the $0.9 million loss contingency as a current liability on our balance sheet at December 31, 2019, and recorded the $0.6 million of expected insurance proceeds from our D&O insurance carrier as a current receivable on our balance sheet at December 31, 2019. The $0.3 million settlement amount payable by the Company was recorded to the statement of operations and comprehensive loss for the year ended December 31, 2019. The settlement is contingent upon both the parties’ entry into a definitive settlement agreement and court approval.

License Agreements

We have license agreements with third parties that require us to make annual license maintenance payments and future payments upon the success of licensed products that include milestones and/or royalties. Minimum future payments over the next five years are not material.