Commitments and Contingencies - Additional Information (Detail) |
1 Months Ended | 6 Months Ended | |
|---|---|---|---|
|
Aug. 31, 2017
USD ($)
shares
|
Dec. 31, 2017
USD ($)
ft²
|
Jun. 30, 2017
USD ($)
|
|
| Purchase Commitment, Excluding Long-term Commitment [Line Items] | |||
| Lease expiration month and year | 2020-05 | ||
| Lease commencement month and year | 2017-06 | ||
| Lease arrangement rent area, square feet | ft² | 13,700 | ||
| Lease rental rate | $ 45,000 | ||
| Remaining contractual obligation | 1,300,000 | ||
| Future aggregate milestone payments | 75,200,000 | ||
| Common stock value | 0 | $ 0 | |
| Accrued payment for potential future milestone | $ 0 | ||
| Percentage of Purchase Requirement | 100.00% | ||
| License and supply agreement notice period | 90 days | ||
| Phase Three Clinical Trial | |||
| Purchase Commitment, Excluding Long-term Commitment [Line Items] | |||
| First milestone payment | $ 200,000 | ||
| Common stock value | $ 500,000 | ||
| Issuance of common stock to purchase asset, shares | shares | 166,527 |