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Convertible Notes Payable - Summary of Common Stock and Preferred Stock Shares Issued under Notes and New Notes (Parenthetical) (Detail) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 28, 2017 | Nov. 15, 2017 | Oct. 10, 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 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 28, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | $ 12,210,000 | $ 40,121,000 | $ 35,000,000 | $ 649,000 | $ 0
Gain (loss) on warrant extinguishment |  | $ (21,000,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,613,000 |  | $ 0 | $ 0
Restructuring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on warrant extinguishment |  |  | $ (2,300,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt settlement |  |  |  | $ 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | 247,417 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal | $ 2,474,174 | $ 8,130,564 |  |  |  |  | $ 4,200,000 | $ 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on warrant extinguishment | (3,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt settlement |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  | 4,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Retirement Per Exchange Agreement [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  | 83 | 229 |  |  | 218 | 344 | 229 | 5 | 87 | 10 | 23 |  |  |  | 642,885 |  |
Common Stock Issued [Member] | Restructuring Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  | 229 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Issued [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued | 445,152 | 194,896 |  |  |  |  | 1,380 | 1,380 |  |  |  |  |  |  |  |  |  |  |  |  |
Provision to Exchange [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  | 1,948 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal |  | $ 600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Updated Conversion Price Formula [Member] | Exchange Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  | 192,948 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in Principal |  | $ 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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