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Stockholders' Equity - Reverse Stock Split - Additional Information (Detail) | May 02, 2018 $ / shares shares | Nov. 06, 2017 $ / shares shares | Jul. 21, 2016 $ / shares shares | Jul. 19, 2016 shares | Jun. 30, 2018 $ / shares shares | Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 $ / shares shares
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Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Reverse stock split ratio | 0.0020 | 0.0029 | 0.0625 |  |  |  |
Number of fractional shares were issued in connected with the reverse stock split |  |  | 0 |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) |  |  |  | 170,000,000 | 1,000,000,000 | 1,000,000,000 | 500,000,000
Reverse stock split | 1:500 | 1:350 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  | 0.1 |  |  |
Maximum [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Reverse stock split ratio |  |  |  | 0.05 |  |  |
Previously Reported [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  | 500,000,000 |
OTCQB [Member] |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |
Reverse stock split ratio | 0.0020 | 0.0029 |  |  |  |  |
Number of fractional shares were issued in connected with the reverse stock split | 0 | 0 |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 |  |  |  |  |
Reverse stock split | 1:500 |  |  |  |  |  |

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- Definition Face amount or stated value per share of common stock. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: 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(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Reduction in the number of shares during the period as a result of a reverse stock split. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- Definition Description of the stock split arrangement. Also provide the retroactive effect given by a stock split that occurs after the balance date but before the release of financial statements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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- 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://fasb.org/us-gaap/role/ref/legacyRef -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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