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Equity Transactions - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 15, 2014 | Dec. 31, 2016 | Sep. 02, 2016
Class of Stock [Line Items] |  |  |
Gross proceeds before deduction commissions and other expenses | $ 5,600,000 |  |
Offering cost related to the transaction | 400,000 |  |
Cash from issuance of common stock, net of offering costs | $ 5,200,000 |  |
Unterberg Koller Capital Fund L.P. and William W. and Dieva L. Smith [Member] | Note and Warrant Purchase Agreement [Member] |  |  |
Class of Stock [Line Items] |  |  |
Warrants expiration period |  | 5 years |
Purchase of warrants |  |  | 1,700,000
Common stock exercise price |  |  | $ 2.74
Notes and warrants issuance date |  | Sep. 06, 2016 |
Unterberg Koller Capital Fund L.P. and William W. and Dieva L. Smith [Member] | Senior Subordinated Notes [Member] | Note and Warrant Purchase Agreement [Member] |  |  |
Class of Stock [Line Items] |  |  |
Aggregate principal amount |  |  | $ 4,000,000
Private Placement [Member] |  |  |
Class of Stock [Line Items] |  |  |
Common stock, issued and sold to investors | 6,845,830 |  |
Common stock, price per share | $ 0.816 |  |
Commission | $ 200,000 |  |
Legal and other expenses | $ 200,000 |  |

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