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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 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) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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