Stockholders' Equity - Common and Preferred Shares - Additional Information (Detail) (USD $)
|
0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended | 0 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | 9 Months Ended | 9 Months Ended | |||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
May 28, 2014
|
Feb. 18, 2014
|
Sep. 23, 2013
|
Apr. 16, 2013
|
Sep. 30, 2013
|
Sep. 30, 2014
|
Sep. 30, 2013
|
May 28, 2014
|
Feb. 18, 2014
|
Dec. 31, 2013
|
Apr. 16, 2013
|
Sep. 30, 2014
2005 Plan [Member]
Participant
|
Sep. 30, 2014
Placement Agent and Related Persons [Member]
|
Sep. 23, 2013
Series A Preferred Stock [Member]
|
Apr. 16, 2013
Series A Preferred Stock [Member]
|
Jun. 30, 2013
Series A Preferred Stock [Member]
|
Dec. 31, 2013
Series A Preferred Stock [Member]
|
Sep. 30, 2013
Series A Preferred Stock [Member]
|
Sep. 23, 2013
Series B Preferred Stock [Member]
|
Sep. 30, 2013
Series B Preferred Stock [Member]
|
Apr. 16, 2013
Private Placement Series A Warrants [Member]
|
Sep. 30, 2014
Private Placement Series A Warrants [Member]
|
Apr. 16, 2013
Private Placement Series A Warrants [Member]
|
Apr. 16, 2013
Private Placement Series B Warrants [Member]
|
Sep. 30, 2014
Private Placement Series B Warrants [Member]
|
Dec. 31, 2013
Private Placement Series B Warrants [Member]
|
Apr. 16, 2013
Private Placement Series B Warrants [Member]
|
Sep. 30, 2014
Common Stock [Member]
|
Sep. 23, 2013
Common Stock [Member]
|
Sep. 30, 2014
Common Stock [Member]
Private Placement Series B Warrants [Member]
|
Dec. 31, 2013
Common Stock [Member]
Private Placement Series B Warrants [Member]
|
May 28, 2014
Registered Offering [Member]
|
May 28, 2014
Registered Offering [Member]
|
Feb. 18, 2014
Public Offering [Member]
|
Sep. 30, 2014
Public Offering [Member]
|
Feb. 18, 2014
Public Offering [Member]
|
Sep. 30, 2014
Private Placement [Member]
|
May 28, 2014
Private Placement [Member]
|
Feb. 18, 2014
Private Placement [Member]
|
Dec. 31, 2013
Private Placement [Member]
Series A Preferred Stock [Member]
|
Dec. 31, 2013
Private Placement [Member]
Series B Preferred Stock [Member]
|
Dec. 31, 2013
Private Placement [Member]
Common Stock [Member]
|
May 28, 2014
Private Placement [Member]
Registered Offering [Member]
|
Feb. 18, 2014
Private Placement [Member]
Public Offering [Member]
|
Sep. 30, 2013
MLV & Co. LLC [Member]
|
Sep. 30, 2014
MLV & Co. LLC [Member]
|
Sep. 30, 2014
Lincoln Park Capital Fund, LLC [Member]
|
Nov. 30, 2011
Lincoln Park Capital Fund, LLC [Member]
|
|
Stockholders' Equity - Common and Preferred Shares [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||
Net proceeds from issuance of common stock and warrants | $ 14,822,000 | $ 10,860,000 | ||||||||||||||||||||||||||||||||||||||||||||||
Gross proceeds from issuance of common stock and warrants | 16,000,000 | 12,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
Share price of common stock and warrants issued | $ 2.9625 | $ 2.05 | ||||||||||||||||||||||||||||||||||||||||||||||
Number of warrants issued for each unit issued | 0.5 | 0.5 | ||||||||||||||||||||||||||||||||||||||||||||||
Common stock issued during period | 5,000 | 5,800 | 350,000 | 270,390 | 5,400,847 | 5,853,657 | 422,000 | |||||||||||||||||||||||||||||||||||||||||
Exercise of warrants, shares of Company's common stock converted | 1,054,625 | 1,377,412 | 1,377,412 | 2,452,431 | 2,700,424 | 2,926,829 | 0 | 216,033 | 292,682 | |||||||||||||||||||||||||||||||||||||||
Term of warrants | 5 years 3 months 18 days | 5 years | 5 years | |||||||||||||||||||||||||||||||||||||||||||||
Exercise Price | $ 2.24 | $ 2.90 | $ 2.75 | $ 2.80 | $ 3.40 | $ 3.40 | $ 3.40 | $ 3.40 | $ 3.7031 | $ 2.56 | ||||||||||||||||||||||||||||||||||||||
Percentage of warrants owned | 4.99% | 9.99% | ||||||||||||||||||||||||||||||||||||||||||||||
Increase in percentage of warrants owned | 9.99% | |||||||||||||||||||||||||||||||||||||||||||||||
Number of warrant exercised | 1,054,625 | 2,452,431 | ||||||||||||||||||||||||||||||||||||||||||||||
Proceeds from warrant exercises | 9,512,000 | 432,000 | 1,119,000 | 864,000 | 5,493,000 | 2,900,000 | ||||||||||||||||||||||||||||||||||||||||||
Gross proceeds | 5,800,000 | 5,000,000 | ||||||||||||||||||||||||||||||||||||||||||||||
Net proceeds | 4,905,000 | 4,192,000 | 2,103,000 | |||||||||||||||||||||||||||||||||||||||||||||
Number of common stock issued upon conversion | 1,377,412 | 2,452,431 | 2,452,431 | 605,422 | ||||||||||||||||||||||||||||||||||||||||||||
Number of preferred stock converted | 2,198 | 5,800 | ||||||||||||||||||||||||||||||||||||||||||||||
Number of preferred stock outstanding | 0 | 0 | 2,802 | 0 | 2,802 | 0 | ||||||||||||||||||||||||||||||||||||||||||
Redeemable value of outstanding balance | 2,802,000 | 2,802,000 | ||||||||||||||||||||||||||||||||||||||||||||||
Exercisable period of warrants | 5 years | 5 years | 2 years | |||||||||||||||||||||||||||||||||||||||||||||
Purchase of common stock at closing | 147,145 | 82,645 | ||||||||||||||||||||||||||||||||||||||||||||||
Warrant exercised | 350,000 | 270,390 | ||||||||||||||||||||||||||||||||||||||||||||||
Non-cash deemed dividend to preferred stock | 2,318,000 | 4,799,000 | 2,480,000 | 2,310,000 | ||||||||||||||||||||||||||||||||||||||||||||
Proceeds from issuance of common stock, net of issuance costs | 25,681,000 | 1,936,000 | 1,936,000 | |||||||||||||||||||||||||||||||||||||||||||||
Issuance of common stock | 20,706,000 | 5,586,000 | 0 | |||||||||||||||||||||||||||||||||||||||||||||
Value of purchase agreement for the sale with Lincoln Park Capital Fund, LLC | 20,000,000 | |||||||||||||||||||||||||||||||||||||||||||||||
Purchase agreement date of expiration | January 11, 2015 | |||||||||||||||||||||||||||||||||||||||||||||||
Minimum purchase price per share | $ 6.00 | |||||||||||||||||||||||||||||||||||||||||||||||
Additional value of purchase agreement for the sale with Lincoln Park Capital Fund, LLC | 17,400,000 | |||||||||||||||||||||||||||||||||||||||||||||||
Warrant closing date | Jul. 20, 2014 | |||||||||||||||||||||||||||||||||||||||||||||||
Maximum number of shares acquired for the award of options, restricted stock and stock appreciation | 833,333 | |||||||||||||||||||||||||||||||||||||||||||||||
Maximum number of shares granted to any one participant in any fiscal year | 200,000 | |||||||||||||||||||||||||||||||||||||||||||||||
Number of participant | 1 | |||||||||||||||||||||||||||||||||||||||||||||||
Weighted average period for recognizing unrecognized compensation cost as expense | 3 years | |||||||||||||||||||||||||||||||||||||||||||||||
Unrecognized compensation cost related to stock option awards | $ 546,000 |