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Summary of Significant Accounting Policies - Additional Information (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Summary Of Significant Accounting Policies [Line Items] |  |
Non-controlling interest | $ 0 | $ 361
Cash equivalents maximum maturity period of highly liquid investments | 90 days |
Minimum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of business days for related transactions | 1 day |
Loan forgiven over service period | 3 years |
Minimum [Member] | Furniture and Fixtures [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Depreciation and amortization on straight-line basis | 3 years |
Maximum [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of business days for related transactions | 2 days |
Loan forgiven over service period | 9 years |
Maximum [Member] | Furniture and Fixtures [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Depreciation and amortization on straight-line basis | 7 years |
Securities |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of business days for related transactions | 2 days |
Commodities |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Number of business days for related transactions | 1 day |

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(24)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(22)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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