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Description of Business and Basis of Preparation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 0 Months Ended | 3 Months Ended | 0 Months Ended
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Mar. 17, 2014 | Mar. 31, 2014 | May 07, 2014 Subsequent Event [Member] | Apr. 25, 2014 Subsequent Event [Member]
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] |  |  |  |
Formation date |  | Nov. 04, 1999 |  |
Reverse stock split ratio, description |  | 1-for-4 reverse stock split |  | 1-for-5.1 reverse stock split
Reverse stock split ratio | 0.250 |  |  | 0.196
Number of shares of common stock sold |  |  | 6,200,000 |
Public offering price per share |  |  | $ 10 |
Net proceeds from initial public offering (IPO) |  |  | $ 54.8 |
Underwriting discounts and commissions |  |  | 3.3 |
Offering expenses |  |  | $ 3.9 |
Number of outstanding shares of convertible preferred stock converted into common stock |  |  | 1,691,884 |
Outstanding warrants exercised |  |  | 275,687 |

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