Please assess the completion status of the following clinical trial:

Trial Title: Exploratory Study of SPD489 in Adults With Major Depressive Disorder (MDD) as Augmentation Therapy to an Antidepressant

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: TRIPLE
- Phase: PHASE2
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Adults aged 18-55 with a primary diagnosis of nonpsychotic MDD~Exclusion Criteria:~* History of non-response to multiple antidepressants

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 55 Years
- Healthy Volunteers: f

Study Arms:
- Active (Type: EXPERIMENTAL): Antidepressant + SPD489
- Placebo (Type: PLACEBO_COMPARATOR): Antidepressant + placebo

Based on this trial design, predict the completion outcome and termination type (if applicable).