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Fair Value Measurements (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 03, 2019
Fair value measurements
Restricted cash	$ 603,000		$ 603,000
NanoString
Fair value measurements
Contingent consideration, maximum to be paid				$ 10,000,000.0
Headquarters and laboratory facilities, South San Francisco, lease signed April 2015
Fair value measurements
Restricted cash	603,000		603,000
Level I | Headquarters and laboratory facilities, South San Francisco, lease signed April 2015
Fair value measurements
Restricted cash	603,000		603,000
Level I | Money market funds
Fair value measurements
Financial assets	150,700,000		57,600,000
Overnight repurchase agreements
Fair value measurements
Unrealized Gain (Loss) on Investments	0	$ 0
Overnight repurchase agreements | Level II
Fair value measurements
Cash and and cash equivalents, fair value	$ 0		$ 100,000,000.0

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion 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.

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No definition available.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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