Commitments and Contingencies - Schedule of Reconciliation of Undiscounted Cash Flows to Lease Liabilities Recognized (Parenthetical) (Detail)
Jun. 30, 2019
|Operating Leases Future Minimum Payments Due [Abstract]|
|Weighted average discount rate percent||10.00%|
Weighted average discount rate for operating lease calculated at point in time.
Reference 1: http://www.xbrl.org/2003/role/disclosureRef