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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 26, 2016 | Jun. 15, 2016 | Apr. 14, 2016 | Jun. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 25, 2016 | Jun. 16, 2016 | Jan. 30, 2015
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock purchase price |  |  | $ 3.99 |  |  |  |  |  |  |
Aggregate payment of Placement agent, escrow agents and legal fees |  |  | $ 1,800 |  |  |  |  |  |  |
Additional issued units |  |  |  | 334,169 |  |  |  |  |  |
Placement fees |  |  |  |  | $ 0 | $ 0 | $ 3,733 |  |  |
Warrants outstanding |  | 1,002,507 |  |  |  |  |  |  |  |
M.M. Dillon & Co. Group [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Warrant to purchase stock, shares |  |  | 100,000 |  |  |  |  |  |  |
Placement fees |  |  | $ 200 |  |  |  |  |  |  |
Majority Shareholder [Member] | Allenex [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of common stock purchased |  |  |  | 1,002,507 |  |  |  |  |  |
Shares of common stock subject to outstanding common stock warrants [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement offer |  |  | 3,000 |  | 1,700 |  |  |  |  |
Warrant to purchase stock, shares |  |  |  |  |  |  |  |  | 200,000 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  | 510,777 |  |  |
Proceeds from issuance of private placement offer |  |  | 1,900 |  | $ 1,000 |  |  |  |  |
Warrant to purchase stock, shares |  |  |  |  |  |  |  |  |  | 34,483
Warrants outstanding |  |  |  |  | 3,259,926 |  |  |  |  |
Exercise Price |  |  |  |  |  |  |  |  |  | $ 6.96
Series A Preferred Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of private placement offer |  |  | $ 9,300 |  | $ 5,300 |  |  |  |  |
Preferred shares convertible to common stock |  |  |  |  | 1,670,845 |  |  |  |  |
Convertible preferred stock shares issued upon conversion |  |  |  |  |  |  |  |  | 1 |
Private Placement [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Securities purchase agreement private placement units description |  |  |  |  | On April 14, 2016, the Company completed the sale of 591,860 units (“Units”) to certain accredited investors (the “Private Placement”) at a purchase price of $23.94 per Unit. Each Unit was comprised of (i) one share of the Company’s common stock, (ii) five shares of Series A Mandatorily Convertible Preferred Stock (“Series A Preferred”), and (iii) three warrants, each to purchase one share of the Company’s common stock. |  |  |  |  |
Common stock shares issued |  |  | 591,860 |  |  |  |  |  |  |
Common stock offer price per share |  |  | $ 23.94 |  |  |  |  |  |  |
Proceeds from issuance of private placement offer |  | $ 8,000 | $ 14,200 |  |  |  |  |  |  |
Placement fees |  |  | $ 1,100 |  |  |  |  |  |  |
Warrants outstanding | 1,775,580 |  | 1,975,580 |  |  |  |  |  |  |
Exercise Price | $ 4.00 |  |  |  |  |  |  | $ 4.98 |  |
Public Offering [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock shares issued | 2,250,000 |  |  |  |  |  |  |  |  |
Common stock offer price per share | $ 4.00 |  |  |  |  |  |  |  |  |
Gross proceeds from common stock shares issued at public offering | $ 9,000 |  |  |  |  |  |  |  |  |
Net proceeds from common stock shares issued at public offering | 7,800 |  |  |  |  |  |  |  |  |
Public Offering [Member] | Allenex [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from common stock shares issued at public offering | $ 9,000 |  |  |  |  |  |  |  |  |
Subsequent Financing [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Warrants outstanding | 1,002,507 |  |  |  |  |  |  |  |  |
Exercise Price | $ 4.00 |  |  |  |  |  |  | 4.98 |  |
Subsequent Financing [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise Price | $ 4.00 |  |  |  |  |  |  | $ 4.98 |  |

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