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Marketable Securities - Summary of Marketable Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available For Sale Securities [Line Items]        
Marketable securities, Amortized Cost Basis $ 29,371 $ 30,776    
Marketable securities, Unrealized Gains 159 12    
Marketable securities, Unrealized Losses (13) (104)    
Marketable securities, Aggregate Fair Value 29,517 30,684    
Cash and cash equivalents 9,165 6,736 $ 3,654 $ 6,490
Less: cash equivalents (3,722) (2,692)    
Short-Term Marketable Securities        
Schedule of Available For Sale Securities [Line Items]        
Marketable securities, Amortized Cost Basis 17,810 24,393    
Marketable securities, Unrealized Gains 23 1    
Marketable securities, Unrealized Losses (13) (96)    
Marketable securities, Aggregate Fair Value 17,820 24,298    
Short-Term Marketable Securities | Corporate Debt Securities        
Schedule of Available For Sale Securities [Line Items]        
Marketable securities, Amortized Cost Basis 16,014 22,613    
Marketable securities, Unrealized Gains 22 1    
Marketable securities, Unrealized Losses (13) (96)    
Marketable securities, Aggregate Fair Value 16,023 22,518    
Short-Term Marketable Securities | United States Treasury        
Schedule of Available For Sale Securities [Line Items]        
Marketable securities, Amortized Cost Basis 999 990    
Marketable securities, Aggregate Fair Value 999 990    
Short-Term Marketable Securities | U.S. Government Agency Securities        
Schedule of Available For Sale Securities [Line Items]        
Marketable securities, Amortized Cost Basis 797 790    
Marketable securities, Unrealized Gains 1      
Marketable securities, Aggregate Fair Value 798 790    
Long-Term Marketable Securities        
Schedule of Available For Sale Securities [Line Items]        
Marketable securities, Amortized Cost Basis 11,561 6,383    
Marketable securities, Unrealized Gains 136 11    
Marketable securities, Unrealized Losses   (8)    
Marketable securities, Aggregate Fair Value 11,697 6,386    
Long-Term Marketable Securities | Corporate Debt Securities        
Schedule of Available For Sale Securities [Line Items]        
Marketable securities, Amortized Cost Basis 11,561 6,383    
Marketable securities, Unrealized Gains 136 11    
Marketable securities, Unrealized Losses   (8)    
Marketable securities, Aggregate Fair Value 11,697 6,386    
Short Term Marketable Securities | Money Market Accounts        
Schedule of Available For Sale Securities [Line Items]        
Cash and cash equivalents 3,722 2,692    
Cash and cash equivalents fair value disclosure $ 3,722 $ 2,692