Bridge Loan Financing - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands |
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12 Months Ended |
Jun. 26, 2015 |
Feb. 04, 2014 |
Jun. 26, 2013 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Short-term Debt [Line Items] |
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| Convertible notes issues |
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$ 3,000
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| Estimated fair value of warrants outstanding |
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$ 800
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| Adjustment to preferred stock warrant liability recorded in other income (expense) |
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$ (2,559)
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(126)
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| Loss on extinguishment of debt |
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143
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$ 318
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| Series C Redeemable Convertible Preferred Stock [Member] |
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| Short-term Debt [Line Items] |
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| Risk free interest rate |
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1.52%
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| Expected life |
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4 years 4 months 21 days
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| Volatility rate |
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65.00%
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| Series C Warrants [Member] |
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| Short-term Debt [Line Items] |
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| Risk free interest rate |
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1.50%
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1.30%
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| Expected life |
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4 years 4 months 24 days
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4 years 6 months
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| Volatility rate |
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65.00%
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64.00%
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| Bridge Loan Financing [Member] |
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| Short-term Debt [Line Items] |
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| Convertible notes issues |
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$ 3,000
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| Maturity date of debt |
Jun. 26, 2018
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| Conversion basis |
If a liquidation event were to occur prior to June 26, 2018, the notes could be converted at the option of the holder for an amount equal to two times the outstanding principal balance of the notes in cash or the issuance of Series B preferred stock equal to the outstanding principal balance of the notes divided by 0.9.
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| Interest rate |
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7.00%
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| Warrants to purchase stock, shares issued |
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85,703
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| Warrants to purchase stock, exercise price |
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$ 7.00
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| Fair value of warrants granted |
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$ 300
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| Risk free interest rate |
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1.20%
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| Expected life |
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5 years
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| Volatility rate |
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64.00%
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| Expected dividend |
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$ 0
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| Adjustment to preferred stock warrant liability recorded in other income (expense) |
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$ 0
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$ (1,900)
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$ (100)
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| Loss on extinguishment of debt |
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$ 300
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| Bridge Loan Financing [Member] | Common Stock [Member] |
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| Short-term Debt [Line Items] |
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| Share warrants outstanding |
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85,703,000
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85,703,000
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| Bridge Loan Financing [Member] | Series C Redeemable Convertible Preferred Stock [Member] |
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| Short-term Debt [Line Items] |
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| Shares issued Conversion price |
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428,526
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| Conversion price |
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$ 7.00
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| Accrued interest payable |
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$ 20
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| Bridge Loan Financing [Member] | Series C Warrants [Member] |
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| Short-term Debt [Line Items] |
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| Estimated fair value of warrants outstanding |
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$ 2,300
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$ 400
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| Share warrants outstanding |
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0
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