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Stockholders' Equity (Details) - $ / shares
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of Common Shares Underlying Warrants 1,051,358 1,922,781
3.97 [Member] | Warrant [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of Common Shares Underlying Warrants [1] 100,778  
Issue Date Mar. 01, 2007  
Exercise Price $ 3.97  
Expiration Date Mar. 01, 2017  
1.63 [Member] | Derivative Instrument Warrants [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of Common Shares Underlying Warrants [2] 903,996  
Issue Date Jul. 01, 2010  
Exercise Price $ 1.63  
Expiration Date Jan. 01, 2017  
1.61 [Member] | Warrant [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Number of Common Shares Underlying Warrants [1] 46,584  
Issue Date Mar. 01, 2012  
Exercise Price $ 1.61  
Expiration Date Mar. 01, 2022  
[1] These warrants to purchase common stock are classified as equity.
[2] Because of the presence of net settlement provisions, these warrants to purchase common stock are classified as derivative liabilities. The fair value of these liabilities (see Note 3 – Fair Value Measurements) is remeasured at the end of every reporting period and the change in fair value is reported in the accompanying unaudited condensed consolidated statements of operations as other income (expense).