Financial Instruments - Schedule of Marketable Securities That Have Been in Continuous Unrealized Loss Position for Less than 12 months and for 12 months or Greater (Detail) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
---|---|---|
Cash And Cash Equivalents [Abstract] | ||
Fair Value of Marketable Securities, Continuous Unrealized Losses, Less than 12 Months | $ 13,565 | $ 39,576 |
Fair Value of Marketable Securities, Continuous Unrealized Losses, Total | 13,565 | 39,576 |
Unrealized Losses, Continuous Unrealized Losses, Less Than 12 Months | (48) | (134) |
Unrealized Losses, Continuous Unrealized Losses, Total | $ (48) | $ (134) |
X | ||||||||||
- References No definition available.
|
X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
X | ||||||||||
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
X | ||||||||||
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|