Business - Narrative (Details)	Jun. 30, 2020 patient
GATHER1 Trial
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of patients enrolled in trial	286
GATHER2 Trial
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of patients planned to enroll in trial	400
OPH2005 Trial
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of patients planned to enroll in trial	120
Number of additional patients planned to enroll in trial	25