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Convertible Notes Payable - Summary of Common Stock and Preferred Stock Shares Issued under Notes and New Notes (Detail) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2017 | Nov. 15, 2017 | Nov. 06, 2017 | Aug. 28, 2017 | Aug. 04, 2017 | Jul. 07, 2017 | Jul. 02, 2017 | Jun. 07, 2017 | May 09, 2017 | Apr. 10, 2017 | Mar. 13, 2017 | Mar. 02, 2017 | Feb. 10, 2017 | Feb. 01, 2017 | Jan. 12, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 28, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable Conversion Price |  |  |  |  | $ 5,250.00 | $ 12,250.00 |  |  | $ 8,750.00 | $ 10,500.00 | $ 19,250.00 | $ 24,500.00 | $ 35,000.00 | $ 56,000.00 | $ 63,000.00 |  |  |  |  |  |
Reduction in Principal |  |  |  |  | $ 1,015,848 | $ 2,000,000 |  |  | $ 1,913,915 | $ 3,621,286 | $ 4,417,829 | $ 125,999 | $ 3,045,817 | $ 544,000 | $ 1,478,318 | $ 0 | $ 15,831,000 | $ 40,121,000 | $ 35,000,000 | $ 649,000 | $ 0
Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares | 247,417 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable Conversion Price | $ 10.00 | $ 41.72 |  |  |  |  | $ 12,250.00 | $ 12,250.00 |  |  |  |  |  |  |  |  |  |  | $ 10.00 |  |
Reduction in Principal | $ 2,474,174 | $ 8,130,564 |  |  |  |  | $ 4,200,000 | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Applicable Conversion Price |  |  |  | $ 5,250.00 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrant Exchange [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal |  |  | $ 279,016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal | $ 553,234 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  | 83 | 229 |  |  | 218 | 344 | 229 | 5 | 87 | 10 | 23 |  |  |  | 642,885 |  |
Common Stock Issued [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares | 445,152 | 194,896 |  |  |  |  | 1,380 | 1,380 |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Issued [Member] | Restructuring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares |  |  |  | 229 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock Issued [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  | 4,200 | 4,200 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 + Details
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