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Investments - Schedule of Short-term Investments (Details) - Cash Equivalents - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost $ 12,494 $ 29,047
Gross Unrealized Holding Gains 0 0
Gross Unrealized Holding (Losses) 0 0
Fair Value 12,494 29,047
Money Market Funds    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost [1] 12,494 29,047
Gross Unrealized Holding Gains [1] 0 0
Gross Unrealized Holding (Losses) [1] 0 0
Fair Value [1] $ 12,494 $ 29,047
[1] As of December 31, 2019, the money market funds included $5.0 million in restricted cash, and as of December 31, 2018, the money market funds included $5.0 million in restricted cash.