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Debt - Loan and Security Agreement and Warrant Agreement - Additional Information (Detail) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) d $ / shares | Jun. 30, 2014 USD ($) | Jun. 16, 2015 $ / shares shares | Jun. 11, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest expense payable in cash |  |  |  |  |  |  | $ 3,338,000
Hercules Loan and Security Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Fair value of warrant derivative liabilities at issuance, recorded as debt discount |  |  | $ 11,000 |  |  |  |
Interest expense | $ 820,000 | $ 156,000 | $ 6,784,000 | $ 560,000 |  |  |
Hercules Loan and Security Agreement [Member] | Term Loan [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Term loan principal amount |  |  |  |  |  | $ 7,000,000 |
Floating annual rate |  |  | 9.50% |  |  |  |
Debt instrument basis spread |  |  | 8.50% |  |  |  |
Basis of debt instrument interest rate |  |  | The prime rate as reported by The Wall Street Journal minus 3.25% plus (b) 8.50%. |  |  |  |
Debt instrument payment terms |  |  | The Company is required to make interest payments in cash on the first business day of each month, beginning on July 1, 2015. Beginning on August 1, 2016, the Company will be required to make monthly payments on the first business day of each month consisting of principal and interest based upon a 30-month amortization schedule |  |  |  |
Debt instrument periodic payment frequency |  |  | 30-month amortization schedule |  |  |  |
Repayment charges |  |  | $ 245,000 |  |  |  |
Percentage of prepayment fee | 1.00% |  | 1.00% |  |  |  |
Percentage of prepayment fee | 3.00% |  | 3.00% |  |  |  |
Maximum principal amount available for conversion into common shares | $ 1,000,000 |  | $ 1,000,000 |  |  |  |
Debt instrument, convertible, stock price trigger | $ / shares |  |  | $ 11.73 |  |  |  |
Debt instrument, convertible, threshold trading days | d |  |  | 7 |  |  |  |
Number of shares available for purchase of common stock in warrants | shares |  |  |  |  | 25,150 |  |
Common stock exercise price | $ / shares |  |  |  |  | $ 8.35 |  |
Warrants expiration date |  |  | Jun. 16, 2020 |  |  |  |
Interest expense | 34,000 |  | $ 34,000 |  |  |  |
Interest expense payable in cash | 27,000 |  | 27,000 |  |  |  |
Hercules Loan and Security Agreement [Member] | Term Loan [Member] | Maximum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repurchase of securities | 1,000,000 |  | 1,000,000 |  |  |  |
Hercules Loan and Security Agreement [Member] | Term Loan [Member] | Private Placement [Member] | Minimum [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repurchase of securities | $ 10,000,000 |  | $ 10,000,000 |  |  |  |
Hercules Loan and Security Agreement [Member] | Term Loan [Member] | Prime Rate [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument basis spread |  |  | 3.25% |  |  |  |

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