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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Schedule of Significant Balance of Accounts Receivable | The Company has not experienced any loss on its deposits of cash and cash equivalents. Included in current assets are significant balances of accounts receivable as follows:
|  | December 31, |
|  | 2017 |  |  | 2016 |
Astellas Pharma Inc. (“Astellas”)—Related party |  |  | 47 | % |  |  | 39 | %
AstraZeneca AB (“AstraZeneca”) |  |  | 53 | % |  |  | 61 | %

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