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Stockholders Equity - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2013
IPO
Mar. 19, 2013
IPO
Jun. 30, 2013
IPO
Overallotment Option
Jun. 30, 2014
2009 Unit Offering
Aug. 31, 2009
2009 Unit Offering
Jun. 30, 2014
2010 Unit Offering
Nov. 30, 2010
2010 Unit Offering
Aug. 31, 2009
Warrant
2009 Unit Offering
Nov. 30, 2010
Warrant
2010 Unit Offering
Jun. 30, 2014
Warrant
2010 Unit Offering
Jun. 30, 2014
Warrant
2010 Unit Offering
Dec. 31, 2013
Warrant
2010 Unit Offering
Jun. 30, 2014
Stockholder Rights Plan
Jun. 30, 2014
Sales Agreement
Cantor
Dec. 31, 2013
Sales Agreement
Cantor
Stockholders Equity Note [Line Items]                                        
Warrants to purchase an aggregate shares of common stock                   2,400,000   3,700,000                
Warrant exercise price                   2.90   3.20                
Exercisable period                         5 years 5 years            
Net proceeds from underwritten public offering                           $ 19,700,000            
Payment for underwriting discounts and commissions and stock issuance cost           500,000               1,300,000            
Number of units sold in underwritten public offering                           7,400,000            
Number of common stock in each unit                           1            
Number of common stock shares purchasable with each warrant                           0.5            
Units issued, price per unit                           $ 2.85            
Common stock, number of shares issued           8,300,000   1,300,000           7,400,000         900,000 5,400,000
Warrants exercisable date                           May 15, 2011            
Gain (Loss) from revaluation of warrant liability 3,491,000 686,000 12,525,000 (4,387,000)                                
Warrants exercised                             157,894 157,894 186,586      
Warrant liability 7,653,000   7,653,000   20,390,000 [1]       2,400,000   3,300,000                  
Maximum common stock offering price                                     70,000,000  
Percentage of proceeds payable as compensation to underwriter                                     2.00%  
Proceeds from common stock sold     3,847,000 51,171,000   38,000,000                         3,900,000 23,500,000
Common stock available for sale                                     37,600,000  
Common stock, price per share             $ 4.20                          
Gross proceeds from public offering           40,300,000                            
Underwriter's discount           $ 1,800,000                            
Minimum percentage of common stock acquired by stockholders                                   15.00%    
Designated preferred stock for future issuance                                   250,000    
[1] The financial information in this column was derived from audited financial statements included in the Company's 2013 Annual Report on Form 10-K.