Convertible Preferred Stock - Additional Information (Detail) - USD ($)
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12 Months Ended |
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May 27, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Nov. 06, 2015 |
Dec. 31, 2013 |
| Temporary Equity [Line Items] |
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| Number of common stock issued upon conversion of convertible instrument |
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43,500
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| Common Stock [Member] |
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| Temporary Equity [Line Items] |
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| Number of common stock issued upon conversion of convertible instrument |
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1,661,030
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946,371
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| Series A Convertible Preferred Stock [Member] |
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| Temporary Equity [Line Items] |
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| Series A Preferred Stock, shares outstanding |
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0
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5,110
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| Dividends issued on Preferred Stock |
0
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105
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356
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| Fair value of Series A Preferred Stock dividends |
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$ 172,000
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$ 2,399,000
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| Conversion of preferred stock into common shares |
0
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3,215
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166
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| Preferred stock, accelerated dividend payment date |
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May 27, 2015
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| Number of common stock issued upon conversion of convertible instrument |
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(3,215)
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(166)
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| Preferred Stock, shares eliminated |
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15,000
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| Series A Preferred Stock, shares authorized |
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0
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15,000
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| Series A Preferred Stock, shares issued |
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0
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5,110
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7,920
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| Series A Convertible Preferred Stock [Member] | Common Stock [Member] |
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| Temporary Equity [Line Items] |
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| Number of common stock issued upon conversion of convertible instrument |
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783,740
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40,572
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| Tang Capital Partners, L.P. ("TCP") [Member] |
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| Temporary Equity [Line Items] |
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| Dividend payment terms |
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On May 22, 2015, the Company entered into an agreement (the “Acceleration and Conversion Agreement”) with Tang Capital Partners, L.P. (“TCP”) pursuant to which the Company and TCP agreed to accelerate the next dividend payment date from June 30, 2015 to no later than May 29, 2015, and upon payment of such dividend immediately convert the dividend shares into common stock. In connection therewith, the dividend payment date was accelerated to May 27, 2015. There were no shares of Series A convertible preferred stock (“Series A Preferred Stock”) outstanding after the completion of the Acceleration and Conversion Agreement.
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| Tang Capital Partners, L.P. ("TCP") [Member] | Series A Convertible Preferred Stock [Member] |
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| Temporary Equity [Line Items] |
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| Series A Preferred Stock, shares outstanding |
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0
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