Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details Textual)

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Stockholders' Equity (Details Textual) - Equity Component [Domain] - USD ($)
1 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2014
Jan. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Stockholders Equity [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 2.26 $ 2.16  
Warrants Issued During Period   6,872,859      
Share Price   $ 2.91      
Proceeds from Issuance of Common Stock   $ 20,000,000      
Net proceeds received from issuance   $ 18,630,000      
Stock or Unit Option Plan Expense     $ 4,412,000    
Compensation Expenses Unvested Restricted Stock term period     2 years 2 months 12 days    
Common Stock, Capital Shares Reserved for Future Issuance     42,600,000    
March 2013 long-term debt [Member]          
Stockholders Equity [Line Items]          
Debt Conversion, Original Debt, Amount         $ 1,000,000
Market Offering Agreement [Member]          
Stockholders Equity [Line Items]          
Share Price     $ 3.77   $ 3.55
Net proceeds received from issuance     $ 2,932,000   $ 838,000
Stock Issued During Period, Shares, New Issues     812,423   249,163
Direct Offering [Member]          
Stockholders Equity [Line Items]          
Warrants Issued During Period   3,436,435      
Class Of Warrant Or Right Exercise Price Of Warrants Issued   $ 3.64      
Warrants Exercisable Years   5 years      
Direct Offering [Member] | Shelf Registration [Member]          
Stockholders Equity [Line Items]          
Common Stock, Shelf Registration   $ 50,000,000      
Phase One [Member] | Warrants And Options [Member]          
Stockholders Equity [Line Items]          
Net proceeds received from issuance     $ 3,074,000   $ 1,714,000
Issuance of common stock from warrants and options exercised (in shares)     1,705,400   1,234,428
Class Of Warrant Or Right Exercise Price Of Warrants And Options Issued     $ 1.94   $ 1.44
Phase Two [Member]          
Stockholders Equity [Line Items]          
Net proceeds received from issuance         $ 20,000
Cashless And Partial Cashless Exercises Price for Warrants and Options     $ 1.72   $ 1.03
Stock Issued For Cashless And Partial Cashless Exercises Of Warrants and Options     52,259   712,539
Number of Warrants and Options Exercised     209,000   1,194,372
General and Administrative Expense [Member] | Extension Of The Term Of Common Stock Warrants [Member]          
Stockholders Equity [Line Items]          
Employee Benefits and Share-based Compensation, Total       $ 2,000,000  
Various Parties [Member]          
Stockholders Equity [Line Items]          
Stock Issued During Period, Shares, New Issues 28,119        
Warrant [Member]          
Stockholders Equity [Line Items]          
Stock Issued During Period Share From Warrants In Conjunction With Debt Transaction 133,329        
Restricted Stock Units (RSUs) [Member]          
Stockholders Equity [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 568
Restricted Stock Units (RSUs) [Member] | March 2013 long-term debt [Member]          
Stockholders Equity [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 805,972