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Common Stock - Additional Information (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 02, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2014 | Sep. 30, 2013 | Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized |  | 50,000,000 |  | 50,000,000 | 50,000,000 |  | 50,000,000
Common stock, par value |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  | $ 0.001
Preferred stock, shares authorized |  | 5,000,000 |  | 5,000,000 | 5,000,000 |  |
Preferred stock, par value |  | $ 0.001 |  | $ 0.001 | $ 0.001 |  |
Net proceeds received from offering after deducting underwriting discount and offering expenses | $ 22,400,000 |  |  |  |  |  |
Gross proceeds from sales of common stock | 24,000,000 |  |  |  |  |  |
Offering expenses | 1,600,000 |  |  | 100,000 |  |  |
Common stock available for sale under offering |  | 22,000,000 |  | 22,000,000 | 22,000,000 |  |
Number of Optioned Common Shares, Option exercises |  |  |  |  | 10,000 | 3,475 |
Restricted stock unit settlements |  |  |  |  | 199,849 | 45,869 |
Unrecognized compensation expense related to stock options granted |  | 3,200,000 |  | 3,200,000 | 3,200,000 |  | 2,700,000
Effect on diluted per share on shares underlying options, restricted stock units and warrants |  | 8,300,000 | 2,900,000 |  | 8,300,000 | 2,900,000 |
Number of warrants exercised |  |  |  |  | 0 | 0 |
MLV [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Underwritten public offering shares of common stock |  |  |  | 809,214 |  |  |
Gross proceeds from sales of common stock |  |  |  | 3,000,000 |  |  |
Pre-Funded Series B warrant and Series B warrant [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Warrant exercisable period |  |  |  |  | 5 years |  |
2010 Performance incentive plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares available for future option grants |  | 938,945 |  | 938,945 | 938,945 |  |
Underwritten Registered Offering [Member] | Series A Warrants [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Strike price of warrants | $ 4.00 |  |  |  |  |  |
Warrant exercisable period | 5 years |  |  |  |  |  |
Underwritten Registered Offering [Member] | Series A [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Underwritten public offering shares of common stock | 5,559,866 |  |  |  |  |  |
Common stock purchase right description | Each Series A unit consisted of one share of common stock and a Series A warrant to purchase up to one-half of one share of common stock at an initial exercise price of $4.00 per share. |  |  |  |  |  |
Underwritten Registered Offering [Member] | Series B [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock, par value | $ 3.47 |  |  |  |  |  |
Issuance of series B pre-funded warrants | 1,340,538 |  |  |  |  |  |
Series B [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock purchase right description | Each Series B unit consisted of a Pre-Funded Series B warrant to purchase up to one share of common stock at an initial exercise price of $0.01 per share and a Series B warrant to purchase up to one-half of one share of common stock at an initial exercise price of $4.00 per share. |  |  |  |  |  |
Strike price of warrants | $ 0.01 |  |  |  |  |  |
Series B [Member] | Series B Warrants [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Strike price of warrants | $ 4.00 |  |  |  |  |  |
Stock options [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Weighted-average period, restricted stock awards |  |  |  |  | 2 years 7 months 6 days |  |
Stock options [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award expiration period |  |  |  |  | 7 years |  |
Stock options [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award expiration period |  |  |  |  | 10 years |  |
Stock options [Member] | Employees and consultants [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 4 years |  |
Stock options [Member] | Board of Directors [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 1 year |  |
Stock options [Member] | Board of Directors [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |
Stock options [Member] | 2010 Performance incentive plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares reserved for issuance under various plans |  | 2,907,615 |  | 2,907,615 | 2,907,615 |  |
Common shares reserved for options currently outstanding |  | 1,285,862 |  | 1,285,862 | 1,285,862 |  |
Restricted stock unit awards [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares reserved for awards currently outstanding |  | 682,808 |  | 682,808 | 682,808 |  | 356,589
Award vesting period |  |  |  |  | 4 years |  |
Weighted-average period, restricted stock awards |  |  |  |  | 3 years 1 month 6 days |  |
Stock based compensation expense |  | 600,000 | 500,000 |  | 1,700,000 | 1,200,000 |
Total unrecognized compensation expense related to the Company's restricted stock unit awards |  | $ 3,900,000 |  | $ 3,900,000 | $ 3,900,000 |  |
Restricted stock unit awards [Member] | 2010 Performance incentive plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common shares reserved for awards currently outstanding |  | 682,808 |  | 682,808 | 682,808 |  |

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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration