Primary Outcomes
Measure: Percentage of Participants with Adverse Events in Part 1
Time: From randomization up to 7 weeks (or up to 14 weeks if the participant is part of the food effect cohort)
Measure: Percentage of Participants with Adverse Events in Part 2
Time: From randomization up to 8 weeks
Measure: Part 2: Change in suicide risk assessed using the Columbia Suicide Severity Rating Scale (C-SSRS)
Time: From randomization up to 8 weeks
Secondary Outcomes
Measure: Part 1: Maximum Observed Plasma Concentration (Cmax) of RO6953958 and its Metabolites RO7021594 and RO7045755 in Fasted and Fed state
Time: Day 1
Measure: Part 1: Time to Reach Maximum Observed Plasma Concentration (Tmax) of RO6953958 and its Metabolites RO7021594 and RO7045755 in Fasted and Fed state
Time: Day 1
Measure: Part 1: Last Quantifiable Concentration (Clast) of RO6953958 and its Metabolites RO7021594 and RO7045755 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Time To the Last Quantifiable Concentration (Tlast) of RO6953958 and its Metabolites RO7021594 and RO7045755 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Terminal Elimination Phase Half-Life (T1/2) of RO6953958 and its Metabolites RO7021594 and RO7045755 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Area Under the Concentration-Time Curve from Time 0 to 12 hours (AUC(0-12h)) of RO6953958 and its Metabolites RO7021594 and RO7045755 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Area Under the Concentration-Time Curve From Time 0 to the Time of the Last Quantifiable Concentration (AUClast) of RO6953958 and its Metabolites RO7021594 and RO7045755 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Area Under the Concentration-Time Curve from Time Extrapolated to Infinity (AUC (0-inf)) of RO6953958 and its Metabolites RO7021594 and RO7045755 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Apparent Clearance (CL/F) of RO6953958 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Apparent Volume of Distribution (V/F) of RO6953958 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Cumulative Amount of Unchanged Drug Excreted into the Urine (Ae) of RO6953958 and its Metabolites RO7021594 and RO7045755 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Fraction of the Administered Drug Excreted into the Urine (Fe) of RO6953958 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Part 1: Renal Clearance of the Drug from Urine (CLR) of RO6953958 in Fasted and Fed state
Time: Day 1 to Day 5
Measure: Parts 2: Cmax of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 and Day 10
Measure: Parts 2: Molecular Weight Adjusted Metabolite-to-Parent Ratio for Cmax of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 and Day 10
Measure: Parts 2: Average Plasma Concentration (Cavg) of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 to Day 14
Measure: Part 2: Tmax of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 and Day 10
Measure: Part 2: Area Under the Concentration-Time Curve (AUC(0-t)) of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 to Day 14
Measure: Part 2: Molecular Weight Adjusted Metabolite-to-Parent Ratio for Area Under the Concentration-Time Curve (AUC(0-t)) of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 to Day 14
Measure: Part 2: T1/2 of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 to Day 14
Measure: Part 2: CL/F of RO6953958
Time: Day 1 to Day 14
Measure: Part 2: V/F of RO6953958
Time: Day 1 to Day 14
Measure: Part 2: Ae of RO6953958
Time: Day 1 to Day 14
Measure: Part 2: Fe of RO6953958
Time: Day 1 to Day 14
Measure: Part 2: CLR of RO6953958
Time: Day 1 to Day 14
Measure: Part 2: Trough Plasma Concentration (Ctrough) of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 to Day 14
Measure: Part 2: Accumulation Ratio based on AUC (Rauc) of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 to Day 14
Measure: Part 2: Accumulation Ratio Based on Cmax (RCmax) of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 to Day 14
Measure: Part 2: Accumulation Ratio based on Ctrough (RCtrough) of RO6953958 and its Metabolites RO7021594 and RO7045755
Time: Day 1 to Day 14