Annual report pursuant to Section 13 and 15(d)

Cash, Cash Equivalents and Short-Term Investments - Additional Information (Details)

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Cash, Cash Equivalents and Short-Term Investments - Additional Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Investments Debt And Equity Securities [Abstract]    
Estimated fair value of contractual maturities of short-term investments $ 21,686 $ 20,169