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Debt - 2015 Bridge Notes - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jun. 15, 2015 | Feb. 28, 2015 | Jun. 30, 2015 | Jun. 30, 2015
Debt Instrument [Line Items] |  |  |  |
Amortization of discount |  |  |  | $ 410,000
Loss on conversion of bridge notes |  |  | $ 1,170,000 | $ 1,170,000
Existing Investor [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible promissory notes issued and sold |  | $ 0 |  |
2015 Bridge Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Convertible promissory notes issued and sold |  | $ 4,500,000 |  |
Debt instrument interest rate |  | 5.00% |  |
Debt instrument interest rate percentage, maximum |  | 15.00% |  |
Debt instrument interest rate terms |  |  |  | The 2015 Bridge Notes had a stated interest rate of 5% per annum, which would reset to 15% upon an event of default
Debt instrument due date |  |  |  | Feb. 26, 2016
Debt instrument conversion price per share |  |  | $ 6.875 | $ 6.875
Debt instrument conversion terms |  |  |  | Upon the completion of the Merger, subject to certain limitations, the unpaid principal amount of the 2015 Bridge Notes, plus accrued but unpaid interest through the date of such transaction, automatically converted into shares of common stock of the Company equal to the principal and unpaid accrued interest dollar value divided by $6.875.
Debt instrument, percentage of principal balance payable on event of default |  |  |  | 25.00%
Fair value of derivative, recorded as derivative liability |  |  | $ 1,547,000 | $ 1,547,000
Embedded derivative |  |  |  | The provisions requiring the embedded interest rate reset upon an event of default, automatic conversion of the convertible promissory notes upon the Merger and the put option upon an event of default or failure to close the Merger each represent an embedded derivative instrument requiring bifurcation from the notes. The embedded derivatives were bundled and valued as one compound derivative in accordance with the applicable accounting guidance for derivatives and hedging.
Amortization of discount |  |  | 276,000 | $ 386,000
Common stock issued upon conversion of notes | 664,559 |  |  |
Loss on increase in the estimated fair value of derivatives | $ 2,692,000 |  |  |
Loss on conversion of bridge notes | $ 1,170,000 |  | 1,170,000 | 1,170,000
Interest expense |  |  | $ 326,000 | $ 459,000

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