Annual report pursuant to Section 13 and 15(d)

Cash Equivalents and Marketable Securities - Additional Information (Details)

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Cash Equivalents and Marketable Securities - Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash And Cash Equivalents [Line Items]    
Long-term marketable securities $ 0 $ 15,609,000
Investments in an unrealized loss position 14,700,000 4,500,000
Unrealized losses 3,000 3,000
Recognition of other-than-temporary impairment $ 0 $ 0
Maximum    
Cash And Cash Equivalents [Line Items]    
Marketable securities maturity period 1 year 1 year