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Related Party Transactions - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Sep. 29, 2017 | Aug. 24, 2017 | Aug. 23, 2017 | Aug. 22, 2017 | Aug. 21, 2017 | Jun. 30, 2017 | May 16, 2017 | Mar. 31, 2017 | Mar. 25, 2017 | Feb. 08, 2017 | Feb. 07, 2017 | Dec. 06, 2016 | Sep. 02, 2016 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,800,000 |  |
Preferred stock transaction |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,500,000 |  |
Proceeds from short term secured borrowing arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200,000 | $ 1,903,000
Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, issued and sold to investors |  |  |  |  |  |  | 85,000 |  |  |  |  |  |  |  |  |
Common stock, price per share |  |  |  |  |  |  | $ 1.10 |  |  |  |  |  |  |  |  |
Series B 10% Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
William W. Smith, Jr. and Dieva L. Smith [Member] | Secured Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from short term secured borrowing arrangement |  |  |  |  |  | $ 1,000,000 |  |  |  |  | $ 1,000,000 | $ 1,000,000 |  |  |  |
Interest rate per annum |  |  |  |  |  | 12.00% |  |  |  |  | 18.00% | 18.00% |  |  |  |
Notes due date |  |  |  |  |  | Sep. 25, 2017 |  |  |  |  | Mar. 24, 2017 | Dec. 14, 2016 |  |  |  |
Debt instrument extended maturity date |  |  |  |  |  | Jul. 25, 2018 |  |  | Jun. 26, 2017 |  |  |  |  |  |  |
Steven L. and Monique P. Elfman [Member] | Secured Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from short term secured borrowing arrangement |  |  |  |  |  | $ 1,000,000 |  |  |  | $ 1,000,000 |  |  |  |  |  |
Interest rate per annum |  |  |  |  |  | 12.00% |  |  |  | 18.00% |  |  |  |  |  |
Notes due date |  |  |  |  |  | Sep. 25, 2017 |  |  |  | Mar. 24, 2017 |  |  |  |  | Mar. 24, 2017 |
Debt instrument extended maturity date |  |  |  |  |  | Feb. 11, 2018 |  | Jun. 23, 2017 |  |  |  |  |  |  |  |
Andrew Arno [Member] | Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, issued and sold to investors |  |  |  |  |  |  | 50,000 |  |  |  |  |  |  |  |  |
Common stock, price per share |  |  |  |  |  |  | $ 1.10 |  |  |  |  |  |  |  |  |
Andrew Arno [Member] | Series B 10% Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued upon convertible debt | 50 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
William W. and Dieva L. Smith [Member] | Secured Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate per annum |  |  |  |  |  |  |  |  |  |  | 18.00% |  |  |  |  |
Notes due date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 24, 2017 |
Debt instrument extended maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jun. 26, 2017 |
William W. and Dieva L. Smith [Member] | Series B 10% Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued upon convertible debt | 2,750 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
William W And Dieva L Smith and Andrew Arno [Member] | Series B 10% Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 2,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note and Warrant Purchase Agreement [Member] | William W. Smith, Jr. and Dieva L. Smith [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants expiration period |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Purchase of warrants |  |  |  |  |  |  |  |  |  |  |  |  | 850,000 |  |  |
Common stock exercise price |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.74 |  |  |
Notes and warrants issuance date |  |  |  |  |  |  |  |  |  |  |  |  | Sep. 06, 2016 |  |  |
Note and Warrant Purchase Agreement [Member] | William W. Smith, Jr. and Dieva L. Smith [Member] | Series B 10% Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock transaction |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Note and Warrant Purchase Agreement [Member] | Senior Subordinated Notes [Member] | William W. Smith, Jr. and Dieva L. Smith [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |  |
New Short-term Secured Borrowing Arrangement [Member] | Steven L. and Monique P. Elfman [Member] | Secured Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Interest rate per annum |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |  |  |
Notes due date |  |  |  | Jan. 25, 2018 | Sep. 25, 2017 |  |  |  |  |  |  |  |  |  | Sep. 25, 2017 |
New Short-term Secured Borrowing Arrangement [Member] | Andrew Arno [Member] | Secured Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from short term secured borrowing arrangement |  | $ 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate per annum |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes due date |  | Jan. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Short-term Secured Borrowing Arrangement [Member] | Andrew Arno [Member] | Series B 10% Convertible Preferred Stock [Member] | Secured Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument extended maturity date |  | Jul. 25, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
New Short-term Secured Borrowing Arrangement [Member] | William W. and Dieva L. Smith [Member] | Secured Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |
Proceeds from short term secured borrowing arrangement |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate per annum |  |  | 12.00% |  |  | 12.00% |  |  |  |  |  |  |  |  |  |
Notes due date |  |  | Jan. 25, 2018 | Jan. 25, 2018 | Sep. 25, 2017 |  |  |  |  |  |  |  |  |  | Sep. 25, 2017 |
New Short-term Secured Borrowing Arrangement [Member] | William W. and Dieva L. Smith [Member] | Series B 10% Convertible Preferred Stock [Member] | Secured Promissory Note [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock transaction |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |

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