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Commitments and Contingences | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |  |
Commitments and Contingences | 10. Commitments and Contingences Litigation The Company is not a party to any litigation and does not have contingency reserves established for any litigation liabilities as of March 31, 2020 and December 31, 2019. | 12. Commitments and Contingences Litigation The Company is not a party to any litigation and does not have contingency reserves established for any litigation liabilities as of December 31, 2019. Lease In April 2019, the Company amended its multi-year lease agreement to relocate its office space in Boston, Massachusetts under an operating lease agreement. The amended lease term is for a period of seven years from the date of relocation on August 1, 2019. The initial annual base rent of the relocation premises is $0.6 million per year, increasing 2% annually. In connection with the lease amendment, the Company issued a new cash-collateralized letter of credit for the benefit of the landlord in the amount of $0.2 million. Rent expense was $0.5 million, $0.3 million and $0 the years ended December 31, 2019, 2018, and 2017, respectively. Obligations to make future minimum lease payments as of December 31, 2019, are as follows:
Year ending December 31, |  | Minimum Lease Payments |
|  | (In thousands) |
2020 |  | $ | 594 |
2021 |  |  | 606 |
2022 |  |  | 618 |
2023 |  |  | 630 |
2024 |  |  | 643 |
Years thereafter |  |  | 1,043 |
Total |  | $ | 4,134 |
Novartis License Agreement The Company is required to pay up to an aggregate of $1.5 million upon the satisfaction of clinical milestones, up to an aggregate of $24 million upon the satisfaction of regulatory milestones for the first indication approved, and up to an aggregate of $18 million upon the satisfaction of regulatory milestones for the second indication approved. In addition, the Company is required to pay up to an aggregate of $125 million upon the satisfaction of commercial milestones, based on the amount of annual net sales. The Company is also required to pay tiered royalties ranging from a mid single-digit percentage to a low teen-digit percentage on annual net sales of products. These royalty obligations last on a product-by-product and country-by-country basis until the latest of (i) the expiration of the last valid claim of a Novartis patent covering a subject product, (ii) the expiration of any regulatory exclusivity for the subject product in a country, or (iii) the 10th anniversary of the first commercial sale in the country, and are subject to a reduction after the expiration of the last valid claim of a Novartis patent or the introduction of a generic equivalent of a product in a country. Silverstein Foundation The Company is obligated to repay the Funding Amount in full to the Silverstein Foundation if it successfully conducts a positive Phase 3 clinical trial of the Product for PD (see Note 7).

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details
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