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Stockholders' Equity - Additional Information (Detail) - USD ($) |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Jun. 15, 2015 | Jun. 10, 2015 | May. 15, 2015 | Nov. 03, 2015 | Jun. 30, 2015 | Sep. 30, 2015 | Dec. 31, 2014 | Aug. 07, 2015 | Apr. 02, 2014
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock shares issued | 9,060,314 |  |  |  |  |  | 9,060,314 | 7,753,717 |  |
Expended or accrued offering cost | $ 200,507 |  |  |  |  |  | $ 200,507 | $ 248,731 |  |
Follow-on Offering [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares issued |  |  |  |  |  | 1,306,597 |  |  |  |
Price per share |  |  |  |  |  | $ 11.40 |  |  |  |
IPO [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  | $ 14,300,000 |  |  |  |  |  |
Common stock, shares issued |  |  |  | 1,250,000 |  |  |  |  |  |
Price per share |  |  |  | $ 11.40 |  |  |  |  |  |
Net proceeds after deducting offering expenses |  |  |  | $ 13,200,000 |  |  |  |  |  |
Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  | $ 645,000 |  |  |  |  |  |  |  |
Net proceeds after deducting offering expenses |  | $ 606,000 |  |  |  |  |  |  |  |
Additional common stock shares issued |  |  | 56,597 |  |  |  |  |  |  |
At-the-Market Program [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Sale of common stock sold under sale agreement | 0 |  |  |  |  |  |  |  |  |
Expended or accrued offering cost | $ 62,000 |  |  |  |  |  | 62,000 |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Securities allowed for issuance |  |  |  |  |  |  |  |  |  | $ 300,000,000
Maximum [Member] | At-the-Market Program [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, value authorized |  |  |  |  |  |  |  |  | $ 30,000,000 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  |  |  | $ 15,000,000 |  |  |
Common stock, shares issued |  |  |  |  |  |  | 1,306,597 | 1,223,453 |  |
Common Stock [Member] | Universal Registration Statement [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock shares issued | 1,223,453 |  |  |  |  |  | 1,223,453 |  |  |
Subsequent Event [Member] | At-the-Market Program [Member] |  |  |  |  |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Gross proceeds from issuance of common stock |  |  |  |  | $ 20,000 |  |  |  |  |
Sale of common stock sold under sale agreement |  |  |  |  | 2,100 |  |  |  |  |

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