Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Business - Additional Information (Details) - USD ($) $ in Thousands	Jul. 28, 2020	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Business Acquisition [Line Items]
Cash and cash equivalents		$ 27,760	$ 87,820	$ 104,768
Tetraphase Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Upfront cash for acquisition	$ 42,990
Future cash payments	$ 16,000