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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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- 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 + Details
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