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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2016
Summary of Significant Accounting Policies |
Schedule of estimated useful lives of property and equipment, net |
Laboratory equipment |  | 5 years
Computer equipment and purchased software |  | 3 years
Leasehold improvements |  | Shorter of asset's useful life or remaining term of lease

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