Balance Sheet Details - Additional Information (Details) - USD ($)	1 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 699,000	$ 699,000		$ 909,000
Inventory, net	7,274,000	7,274,000	$ 2,211,000
Inventory reserves	200,000	200,000	100,000
Proceeds from disposal of tenant improvements and certain equipment		3,070,000
Tetraphase Pharmaceuticals, Inc. | Fair Value Step-Up Adjustment to Inventory
Restricted Cash And Cash Equivalents Items [Line Items]
Inventory, net	2,100,000	2,100,000
San Diego Lease
Restricted Cash And Cash Equivalents Items [Line Items]
Loss on termination of lease	12,900,000
Proceeds from disposal of tenant improvements and certain equipment	3,100,000
Credit Card
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	500,000	500,000	40,000
Standby Letters of Credit | Watertown Lease
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash	$ 200,000	$ 200,000
Standby Letters of Credit | San Diego Lease
Restricted Cash And Cash Equivalents Items [Line Items]
Restricted cash			$ 900,000