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Summary of Significant Accounting Policies - Summary of Investments Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Gain (Loss) on Investments [Line Items]
Amortized Cost	$ 6,077	$ 14,083
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(6)	(12)
Fair Value	6,071	14,071
Held-to-maturity Securities, Noncurrent	0	0
Current Assets
Gain (Loss) on Investments [Line Items]
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	(6)	(12)
Fair Value	6,071	14,071
Non Current Assets
Gain (Loss) on Investments [Line Items]
Gross Unrealized Gain	0	0
Gross Unrealized (Loss)	0	0
Fair Value	$ 0	$ 0

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- Definition

Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

+ References

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
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