Quarterly report pursuant to Section 13 or 15(d)

Cash Equivalents - Components of Cash Equivalents (Details)

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Cash Equivalents - Components of Cash Equivalents (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Cash Equivalents and Marketable Securities [Line Items]      
Cash and cash equivalents $ 87,327 $ 90,498 $ 47,322
Money Market Funds [Member]      
Cash Equivalents and Marketable Securities [Line Items]      
Cash and cash equivalents 68,460 71,248  
Cash and cash equivalents, fair value $ 68,460 $ 71,248