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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

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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=27724398&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=51813488&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=27724398&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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