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Non-Marketable Equity Investments - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Mar. 09, 2020	Mar. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Aggregate carrying amount of non-marketable equity investments		$ 3,000		$ 5,400
Changes in adjustment to carrying value of non-marketable equity investment due to change in fair value		(1,152)	$ 1,300
Cumulative downward adjustments to carrying value of non-marketable equity investments		$ 100
NurseGrid [Member]
Schedule Of Trading Securities And Other Trading Assets [Line Items]
Changes in adjustment to carrying value of non-marketable equity investment due to change in fair value	$ (1,200)

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Change in fair value of non-marketable equity investments.

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- Definition

Gain on non-marketable equity investments.

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- Definition

Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=116654751&loc=SL75117539-209714

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