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Fair Value Measurements and Short-Term Investments - Short-term Investments Available for Sale (Details) - U.S treasury securities $ in Thousands	Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Amortized Cost	$ 19,905
Gross Unrealized
Gains	6
Losses	0
Estimated Fair Value	$ 19,911

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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