Key Inclusion Criteria:

   - Must meet all of the following clinical criteria for MCI due to AD or mild AD and must
   have:

   - A Clinical Dementia Rating (CDR)-Global Score of 0.5.

   - Objective evidence of cognitive impairment at screening

   - An MMSE score between 24 and 30 (inclusive)

   - Must have a positive amyloid Positron Emission Tomography (PET) scan

   - Must consent to apolipoprotein E (ApoE) genotyping

   - If using drugs to treat symptoms related to AD, doses must be stable for at least 8
   weeks prior to screening visit 1

   - Must have a reliable informant or caregiver

Key Exclusion Criteria:

   - Any medical or neurological condition (other than Alzheimer's Disease) that might be a
   contributing cause of the subject's cognitive impairment

   - Have had a stroke or Transient Ischemic Attack (TIA) or unexplained loss of
   consciousness in the past 1 year

   - Clinically significant unstable psychiatric illness in past 6 months

   - History of unstable angina, myocardial infarction, advanced chronic heart failure, or
   clinically significant conduction abnormalities within 1 year prior to Screening

   - Indication of impaired renal or liver function

   - Have human immunodeficiency virus (HIV) infection

   - Have a significant systematic illness or infection in past 30 days

   - Relevant brain hemorrhage, bleeding disorder and cerebrovascular abnormalities

   - Any contraindications to brain magnetic resonance imaging (MRI) or PET scans

   - Alcohol or substance abuse in past 1 year

   - Taking blood thinners (except for aspirin at a prophylactic dose or less)

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply