Significant Contracts	12 Months Ended
Significant Contracts	Dec. 31, 2017
Significant Contracts Disclosure [Abstract]
Significant Contracts	3. Significant Contracts Distribution, Licensing and Research Agreements The Company has entered into licensing agreements with academic and research organizations. Under the terms of these agreements, the Company has received licenses to technology and patent applications. The Company is required to pay royalties on future sales of products employing the technology or falling under claims of patent applications. The most significant licensing agreement is with Daiichi Sankyo. Pursuant to the Daiichi Sankyo license under which the Company licenses certain patent rights for sapacitabine the Company is under an obligation to use reasonable endeavors to develop a product and obtain regulatory approval to sell a product and has agreed to pay Daiichi Sankyo an up-front fee, reimbursement for Daiichi Sankyo’s enumerated expenses, milestone payments and royalties on a country-by-country basis. The up-front fee, Phase 3 entry milestone, and certain past reimbursements have been paid. A further $10.0 million in aggregate milestone payments could be payable subject to achievement of all the specific contractual milestones which are primarily related to regulatory approval in various territories, and the Company’s decision to continue with these projects. Royalties are payable in each country for the term of patent protection in the country or for ten years following the first commercial sale of licensed products in the country, whichever is later. Royalties are payable on net sales. Net sales are defined as the gross amount invoiced by the Company or its affiliates or licensees, less discounts, credits, taxes, shipping and bad debt losses. The agreement extends from its commencement date to the date on which no further amounts are owed under it. If the Company wishes to appoint a third party to develop or commercialize a sapacitabine-based product in Japan, within certain limitations, Daiichi Sankyo must be notified and given a right of first refusal, with the right of first refusal ending sixty days after notification, to develop and/or commercialize in Japan. In general, the license may be terminated by the Company for technical, scientific, efficacy, safety, or commercial reasons on six months’ notice, or twelve months’ notice, if after a launch of a sapacitabine-based product, or by either party for material default. There were no milestones earned in 2016 or 2017. Collaboration, Supply and Licensing Agreements In June 2015, the Company entered into a collaboration, licensing and supply agreement with ManRos Therapeutics SA (“ManRos”), for the exclusive development and commercialization of the Company’s oral seliciclib capsules by ManRos as a treatment for cystic fibrosis (“CF”). Among other terms of the agreement, ManRos licensed rights to the Company’s proprietary clinical data to enable clinical development of seliciclib for CF indications. The agreement provides for supply of seliciclib investigational product for initial and later stage clinical trials of seliciclib in CF and technical assistance related to the Company’s know-how to facilitate these trials. The Company received an up-front payment in July 2015 and reached a development milestone in September 2015. The Company will receive further milestone payments and tiered royalties, if seliciclib is commercialized for the treatment of CF. The upfront and milestone payments have been allocated to the separate deliverables within the arrangement and recognized over the period in which the deliverables are met. The consideration allocated to the main deliverable — the transfer of the Company’s know-how — was determined based on its estimated standalone selling price, using a market approach that identified similar license deals for a Phase 1/2 asset. The Company reviewed various licensing transactions in the public domain in the CF area and similar stage of asset development. In the year ended December 31, 2016 and 2017, the Company recognized revenue of $0 and $0, respectively. In the fourth quarter of 2017, the Company received a $150,000 payment from ManRos in anticipation of ManRos achieving a clinical milestone in 2018. This payment has been recorded as deferred revenues on the balance sheet (part of other current liabilities) as the milestone was not achieved as of December 31, 2017.