Summary of Significant Accounting Policies - Summary of Useful Lives of Property and Equipment (Detail) |
12 Months Ended |
|---|---|
Dec. 31, 2016 | |
| Computer and Office Equipment [Member] | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives, years | 5 years |
| Laboratory Equipment [Member] | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives, years | 8 years |
| Furniture and Fixtures [Member] | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives, years | 7 years |
| Software [Member] | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives, years | 3 years |
| Leasehold Improvements [Member] | |
| Property, Plant and Equipment [Line Items] | |
| Estimated useful lives, description | lesser of 10 years or life of lease |