License and Collaboration Agreements - Schedule of Total Consideration of Business Acquisition (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019	Feb. 27, 2019
Consideration
Contingent consideration	$ 5,200	$ 5,200
Assets Acquired
In-process research and development	173,240	173,240
Myonexus Therapeutics, Inc. [Member]
Consideration
Purchase price	165,000	165,000	$ 8,800
Transactions costs and other fees		8,753
Contingent consideration	4,500	4,500
Total consideration		178,253
Assets Acquired
Cash and cash equivalents	1,197	1,197
Prepaids	3,816	3,816
In-process research and development		173,240
Total assets acquired	178,253	178,253
Liability Assumed
Contingent consideration	4,500	4,500
Total liability assumed	$ 4,500	$ 4,500

Business acquisition total consideration.

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- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of assets acquired at the acquisition date.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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The amount of liability arising from an inherited contingency (as defined) which has been recognized as of the acquisition date.

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Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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The amount of purchased research and development assets that are acquired in a business combination have no alternative future use and are therefore written off in the period of acquisition.

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