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Securities Purchase Agreement and Warrant Issuances - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 26, 2015 | Sep. 08, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |
Common stock shares issued at par value (per share) |  |  | $ 0.001 |  | $ 0.001
Proceeds from the exercise of warrant to purchase common stock |  |  | $ 8,644 | $ 0 |
Series C Preferred Stock |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |
Number of shares sold |  | 87,196 |  |  |
Convertible preferred stock par value per share |  | $ 0.001 |  |  |
Number of shares sold, Per share price |  | $ 17.50 |  |  |
Proceeds from the issuances of Series C preferred and common stock, net of issuance costs |  | $ 14,400 |  |  |
Common Stock |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |
Number of shares sold |  | 7,363,334 |  |  |
Common stock shares issued at par value (per share) |  | $ 0.001 |  |  |
Number of shares sold, Per share price |  | $ 1.75 |  |  |
Common stock warrants outstanding |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |
Warrants to purchase common stock sold (shares) |  | 4,117,647 |  |  |
Exercise price per share ($ per share) |  | $ 2.26 |  |  |
2014 Warrant |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |
Proceeds from the exercise of warrant to purchase common stock | $ 8,600 |  |  |  |
2014 Warrant | Common stock warrants outstanding |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |
Number of shares sold | 3,824,600 |  |  |  |
Exercise price per share ($ per share) |  | $ 2.26 |  |  |
2015 Warrant |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |
Proceeds from the exercise of warrant to purchase common stock | $ 3,500 |  |  |  |
2015 Warrant | Common stock warrants outstanding |  |  |  |  |
Changes In Equity And Comprehensive Income Line Items [Line Items] |  |  |  |  |
Warrants to purchase common stock sold (shares) | 1,593,583 |  |  |  |
Exercise price per share ($ per share) | $ 5.50 |  |  |  |

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