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Fair Value Measurements and Investments - Schedule of Reconciliation of Debt Securities (Detail) - Debt Security [Member] - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |  |
Beginning balance | $ 17,820 | $ 16,050 | $ 12,220
Gains (losses) recorded for the period |  |  |
Recognized in other expense, net | 0 | 0 | (5,585)
Recognized in other comprehensive income (loss) | (2,593) | 1,770 | 9,415
Change in classification of debt security to held to maturity | (15,227) | 0 | 0
Issuance of Warrant as consideration for extension | 491 | 0 | 0
Impairment of Warrant | (491) | 0 | 0
Ending balance | $ 0 | $ 17,820 | $ 16,050

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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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