Preferred Stock, Common Stock and Stockholders' Equity - Common Stock - Additional Information (Detail) - USD ($)
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12 Months Ended |
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Dec. 31, 2015 |
Dec. 31, 2014 |
Feb. 29, 2016 |
Feb. 22, 2016 |
Nov. 13, 2014 |
| Sale Of Stock [Line Items] |
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| Common stock, shares outstanding |
7,201,774
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6,112,091
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| Shareholders voting power description |
Each share of common stock is entitled to one vote. The holders of the common stock are also entitled to receive dividends whenever funds are legally available and when declared by the board of directors of the Company.
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| Dividends declared on common stock |
$ 0
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| Common stock, shares issued |
7,201,774
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6,112,091
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| Proceeds from issuance of common stock, net |
$ 5,031,184
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$ 42,875
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| Legal, Accounting and Filing Fees |
138,000
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| Payroll withholdings from employees |
$ 170,000
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| Common stock for Employee Stock Purchase Plan |
41,176
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7,294
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| Sales Agreement with MLV & Co. LLC [Member] |
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| Sale Of Stock [Line Items] |
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| Common stock, value of shares issuable |
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$ 6,600,000
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| Common stock, shares issued |
1,048,507
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| Common stock , weighted average price per share |
$ 4.78
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| Proceeds from issuance of common stock, net |
$ 4,900,000
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| Aggregate market value of entity common stock held by non affiliates |
$ 75,000,000
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| Sales Agreement with MLV & Co. LLC [Member] | Subsequent Event [Member] |
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| Sale Of Stock [Line Items] |
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| Entity public float, common stock shares |
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4,100,000
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| Entity public float |
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$ 14,600,000
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| Common stock, closing price |
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$ 3.57
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| One third value of entity public float |
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$ 4,800,000
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