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Fair Value of Financial Assets - Additional Information (Details) | Jun. 30, 2018 | Dec. 31, 2017
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Fair Value Disclosures [Abstract] |  |
Discounted cash flow include a discount rate | 15.00% | 15.00%

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- Definition Discounted cash flow discount rate. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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