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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

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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