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Summary of Significant Accounting Policies - Summary of Investments Held to Maturity (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Gain (Loss) on Securities [Line Items]    
Amortized Cost $ 0 $ 6,077,000
Gross Unrealized Gain   0
Gross Unrealized (Loss)   (6,000)
Fair Value   6,071,000
Current Assets    
Gain (Loss) on Securities [Line Items]    
Amortized Cost   6,077,000
Gross Unrealized Gain   0
Gross Unrealized (Loss)   (6,000)
Fair Value   6,071,000
Non Current Assets    
Gain (Loss) on Securities [Line Items]    
Amortized Cost   0
Gross Unrealized Gain   0
Gross Unrealized (Loss)   0
Fair Value   $ 0