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