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Subsequent Events - Additional Information (Details) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 29, 2018 | Mar. 02, 2018 | Jan. 01, 2018 | Mar. 05, 2015 | Sep. 30, 2017 | May 31, 2017 | Aug. 31, 2016 | Mar. 31, 2016 | Oct. 31, 2015 | Mar. 31, 2015 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 25, 2018
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  |  |  |  | 264,480 | 2,918,993 | 4,309,232 |
Exercise price of options |  |  |  |  |  |  |  |  |  |  |  | $ 8.76 | $ 1.53 | $ 0.60 |
Contractual term |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |
Management and employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  | 101,584 | 158,313 | 1,760,368 | 1,157,793 | 3,438,783 | 870,449 |  |  |  |  |
Exercise price of options |  |  |  |  | $ 18.0 | $ 3.0 | $ 1.74 | $ 1.2 | $ 0.6 | $ 0.6 |  |  |  |  |
Contractual term |  |  |  |  | 10 years | 10 years | 10 years | 10 years | 10 years | 10 years |  |  |  |  |
Vesting period |  |  |  |  | 5 years |  | 5 years | 5 years | 5 years | 5 years |  |  |  |  |
Management and employees | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |
Management and employees | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
Management and employees | Vesting anniversary year after the grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  | 20.00% |  | 20.00% | 20.00% |  |  |  |  |  |  |
Management and employees | Vesting anniversary year after the grant date | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
Management and employees | Vesting anniversary year after the grant date | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  | 20.00% |  |  |  |  |  |  |  |  |
Subsequent Event | Group and Hanmi |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Paymet due from party | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accrued payment obligation | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
License and collaboration agreement termination date | Mar. 29, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Entasis Therapeutics Holdings Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-refundable upfront fees obligated to pay |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000
Subsequent Event | Each yearly anniversary from the date of the agreement | Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Independent Directors | Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted |  |  | 37,500 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Certain Management | Restricted Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares granted |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | 2017 Plan | Management and employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  |  |  | 1,153,750 |  |  |  |
Contractual term |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |
Subsequent Event | 2017 Plan | Management and employees | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of options |  |  |  |  |  |  |  |  |  |  | $ 20.74 |  |  |  |
Subsequent Event | 2017 Plan | Management and employees | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price of options |  |  |  |  |  |  |  |  |  |  | $ 24.58 |  |  |  |
Subsequent Event | 2017 Plan | Management and employees | Vesting anniversary year after the grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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