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Fair Value of Financial Instruments - Summary of Investments and Cash Equivalents (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
investment
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Assets:        
Cash and Cash Equivalents $ 72,345 $ 21,661    
Cash-restricted 1,015 2,075    
Total cash, cash equivalents and restricted cash 73,360 23,736 $ 27,961 $ 95,401
Amortized Cost 73,360 60,678    
Gross Unrealized Gain 0 36    
Gross Unrealized Loss 0 0    
Fair Value 73,360 60,714    
Short-Term Marketable Securities $ 0 36,978    
Number of investment in unrealized loss positions | investment 0      
Level I:        
Assets:        
Cash and Cash Equivalents   5,047    
Available-for-sale, amortized cost   41,989    
Gross Unrealized Gain   36    
Gross Unrealized Loss   0    
Available-for-sale, fair value   42,025    
Short-Term Marketable Securities   36,978    
Money market funds | Level I:        
Assets:        
Cash and Cash Equivalents $ 23,201 5,047    
Available-for-sale, amortized cost 23,201 5,047    
Gross Unrealized Gain 0 0    
Gross Unrealized Loss 0 0    
Available-for-sale, fair value 23,201 5,047    
Short-Term Marketable Securities 0 0    
Available-for-sale, cash-restricted 0 0    
US treasury securities | Level I:        
Assets:        
Cash and Cash Equivalents   0    
Available-for-sale, amortized cost   36,942    
Gross Unrealized Gain   36    
Gross Unrealized Loss   0    
Available-for-sale, fair value   36,978    
Short-Term Marketable Securities   36,978    
Total cash        
Assets:        
Cash and Cash Equivalents 49,144 16,614    
Cash-restricted 1,015 2,075    
Total cash, cash equivalents and restricted cash 50,159 18,689    
Cash-unrestricted        
Assets:        
Cash and Cash Equivalents 49,144 16,614    
Cash-restricted        
Assets:        
Cash-restricted $ 1,015 $ 2,075