Non-Recurring Fair Value Measurements - Additional Information (Detail) - USD ($)
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1 Months Ended |
12 Months Ended |
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Dec. 03, 2014 |
Jul. 09, 2014 |
Jul. 20, 2012 |
Mar. 31, 2015 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 08, 2014 |
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Class of Warrants or right to purchase common stock |
44,531
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6,566
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161,977
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7,398
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156,138
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156,138
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44,531
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| Class of Warrants or right to purchase common stock, exercise price |
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$ 9.75
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$ 0.01
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$ 0.01
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| Warrants expiry period |
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10 years
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10 years
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| Fair value of the warrants, risk free interest rate |
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0.22%
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| Fair value of the warrants, implied volatility |
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99.00%
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| Fair value of the warrants, expected term to liquidity |
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1 year 8 months 12 days
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| Fair value of warrants |
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$ 117,000
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| Surrender of warrant to satisfy other liability |
5,839
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| Warrants outstanding |
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156,138
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| Silicon Valley Bank [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Class of Warrants or right to purchase common stock |
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6,566
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| Class of Warrants or right to purchase common stock, exercise price |
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$ 7.99
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| Warrants expiry period |
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10 years
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| Fair value of the warrants, risk free interest rate |
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2.58%
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| Fair value of the warrants, implied volatility |
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87.00%
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| Fair value of the warrants, expected term to liquidity |
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10 years
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| Fair value of warrants |
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$ 51,000
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| Amount of loan to purchase equipment |
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$ 1,750,000
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| Amount of loan, interest rate stated percentage |
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6.00%
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| Bank loan and security agreement, repayment period |
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36 months
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| Warrants outstanding |
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6,566
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| Silicon Valley Bank [Member] | Prime Rate [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Amount of loan bears interest basis spread on variable rate |
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2.75%
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| Series A Preferred Stock [Member] |
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Class of Warrants or right to purchase common stock |
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161,977
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| Class of Warrants or right to purchase common stock, exercise price |
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$ 0.01
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