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Related Party Transactions - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Dec. 06, 2016 | Dec. 31, 2016 | Sep. 02, 2016
Related Party Transaction [Line Items] |  |  |
Proceeds from short term secured borrowing arrangement |  | $ 1,903,000 |
Interest rate per annum |  | 10.00% |
William W. and Dieva L. Smith [Member] | Note and Warrant Purchase Agreement [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 |
William W. and Dieva L. Smith [Member] | Note and Warrant Purchase Agreement [Member] | Senior Subordinated Notes [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Aggregate principal amount |  |  | $ 2,000,000
William W. and Dieva L. Smith [Member] | Secured Promissory Note [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Proceeds from short term secured borrowing arrangement | $ 1,000,000 |  |
Interest rate per annum | 18.00% |  |
Note due and repaid date |  | Dec. 14, 2016 |

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