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Summary of Significant Accounting Policies - Summary of Investments Held to Maturity (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Gain (Loss) on Investments [Line Items]    
Amortized Cost $ 14,083 $ 17,483
Gross Unrealized Gain 0 0
Gross Unrealized (Loss) (12) (33)
Fair Value 14,071 17,450
Held-to-maturity Securities, Noncurrent 0 5,039
Current Assets [Member]    
Gain (Loss) on Investments [Line Items]    
Gross Unrealized Gain 0 0
Gross Unrealized (Loss) (12) (16)
Fair Value 14,071 12,428
Non Current Assets [Member]    
Gain (Loss) on Investments [Line Items]    
Gross Unrealized Gain 0 0
Gross Unrealized (Loss) 0 (17)
Fair Value $ 0 $ 5,022