Loss on Transfer of Nonfinancial Assets	12 Months Ended
	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Loss on Transfer of Nonfinancial Assets	LOSS ON TRANSFER OF NONFINANCIAL ASSETSDuring the year ended December 31, 2019, the Company entered into contractual arrangements with two third parties that transferred the rights to develop and commercialize the programs underlying IPR&D intangible assets acquired in the Merger. As of December 31, 2019, all programs underlying IPR&D intangible assets acquired in the Merger were transferred to these third parties and the Company has no continuing involvement in any ongoing research and development activities associated with the programs. The Company concluded that these third parties are “non-customers” as the underlying development programs transferred to these third parties are focused on potential drug candidates that were not aligned with the Company's strategic focus and, therefore, are not an output of the Company's ordinary activities. Accordingly, the Company accounted for these transactions under ASC Topic 610-20, Gains and Losses from the Derecognition of Nonfinancial Assets (“ASC 610-20”). As a result of the transfer of control of the IPR&D projects to third parties, the Company derecognized the IPR&D intangible assets through a charge to “loss on transfer of nonfinancial assets” in 2019 of $3.9 million, which included the carrying value of the IPR&D of $4.9 million, partially offset by $1.0 million of non-refundable, upfront fees received from the third parties.