Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Dec. 31, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Lessee Lease Description [Line Items]
Lease expense		$ 45,000	$ 100,000	$ 100,000	$ 200,000
Operating lease, cash payments		$ 45,000	$ 100,000	$ 100,000	$ 100,000
Operating lease weighted-average remaining lease term		1 year 4 months 24 days		1 year 4 months 24 days
Operating lease weighted-average discount rate		3.30%		3.30%
Patent infringement suit description				In accordance with the Hatch-Waxman Act, because GIAPREZA is a new chemical entity and the Company filed a complaint for patent infringement within 45 days of receipt of the Notice Letter, the FDA cannot approve Gland’s ANDA any earlier than 7.5 years from the approval of the GIAPREZA NDA unless the District Court finds that all of the asserted claims of the patents-in-suit are invalid, unenforceable and/or not infringed. The Company intends to vigorously enforce its intellectual property rights relating to GIAPREZA.
Merger agreement description				Following the announcement of the Agreement and Plan of Merger (the “Merger Agreement”) with Innoviva, Inc., a Delaware corporation (the “Parent”) and Innoviva Acquisition Sub, Inc., a Delaware corporation and a wholly owned subsidiary of the Parent (the “Purchaser”), and through August 12, 2022, the Company is aware of six complaints that have been filed in United States District Courts and five demand letters that were sent to the Company by purported stockholders of the Company related to the transaction (collectively, the “Complaints”).
Waltham Sublease
Lessee Lease Description [Line Items]
Expiration date	Nov. 30, 2023
Sublease rent per month	$ 15,000