COMMERCIAL PARTNERS AND OTHER AGREEMENTS (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 05, 2012
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative licensing and milestone revenue		$ 125	$ 0	$ 0
Aratana Therapeutics Inc
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative arrangement, option to extend, term		5 years
Eurofarma Labatories S.A.
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative arrangement, upfront payment	$ 300
Hong Kong Pharma Tainuo Ltd.
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative arrangement, upfront payment		$ 10,000
Achievement of Development and Commercial Milestones | Aratana Therapeutics Inc
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative arrangement, milestone payments to be received					$ 40,000
Achievement of Development and Commercial Milestones | Eurofarma Labatories S.A.
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative licensing and milestone revenue		100
Achievement of Development and Commercial Milestones | Hong Kong Pharma Tainuo Ltd.
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaborative arrangement, milestone payments to be received		32,500
DePuy Synthes Sales Inc | Co-Promotion Agreement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Payment of early termination fees		$ 8,800