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Summary of Significant Accounting Policies - Additional Information (Details) |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 06, 2017 | Jul. 21, 2016 | Jul. 19, 2016 | Dec. 31, 2017 Segment
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Maximum period of investments with original maturities from date of acquisition to be cash equivalents |  |  |  | 3 months
Reverse stock split ratio | 0.0029 | 0.0625 |  |
Number of business segments |  |  |  | 1
Minimum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives |  |  |  | 3 years
Reverse stock split ratio |  |  | 0.1 |
Maximum [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives |  |  |  | 7 years
Reverse stock split ratio |  |  | 0.05 |

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- Definition The entity considers investments with original maturities of certain months or less at the date of acquisition to be cash equivalents. + References No definition available. + Details
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- Definition Summary of significant accounting policies. + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 + Details
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