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Stockholders' Equity, Stock Option (Details) - Stock Options [Member] - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2016
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2011
Dec. 31, 2013
Outstanding options, number of shares [Roll Forward]                
Outstanding options, beginning of period (in shares)     1,794,130 1,223,156 1,172,012 1,794,130    
Granted (in shares)       663,431 297,385 497,583    
Exercised (in shares)       (185) 0 (125,601)    
Forfeited (in shares)       (504,559) (246,241) (994,100)    
Outstanding options, end of period (in shares)       1,381,843 1,223,156 1,172,012    
Options vested and expected to vest (in shares)       1,343,443        
Exercisable (in shares)       892,927        
Outstanding options, weighted average exercise price per share [Roll Forward]                
Outstanding options, beginning of period (in dollars per share)     $ 10.65 $ 8.22 $ 9.48 $ 10.65    
Granted (in dollars per share)       2.51 4.89 6.69    
Exercised (in dollars per share)       2.51 0 6.96    
Forfeited (in dollars per share)       7.12 10.20 10.50    
Outstanding options, end of period (in dollars per share)       14.85 $ 8.22 $ 9.48    
Options vested and expected to vest (in dollars per share)       5.96        
Exercisable (in dollars per share)       $ 7.18        
Outstanding options, additional disclosures [Abstract]                
Outstanding options, weighted average remaining contractual term       4 years 11 months 12 days 6 years 7 months 28 days 6 years 3 months 11 days 3 years 7 months 28 days  
Options vested and expected to vest, weighted average remaining contractual term       4 years 9 months 29 days        
Exercisable, weighted average remaining contractual term       2 years 8 months 8 days        
Outstanding options, aggregate intrinsic value       $ 50,000 $ 0 $ 3,000   $ 4,039,000
Options vested and expected to vest, aggregate intrinsic value       48,000        
Exercisable, aggregate intrinsic value       25,000        
Options exercised in period, aggregate intrinsic value       0 0 71,000    
Fair value of options vested       $ 1,300,000 $ 1,000,000 $ 845,000    
Stock options granted (in shares)       663,431 297,385 497,583    
Estimated grant-date fair value (in dollars per share)       $ 0.32 $ 0.68 $ 1.17    
Derived service period       4 years        
Extension of the post-termination exercise period for outstanding stock option grants       90 days        
Compensation cost not yet recognized [Abstract]                
Unrecognized compensation cost related to stock options       $ 592,000        
Weighted average period of recognition for unrecognized compensation cost       2 years 5 months 26 days        
Minimum [Member]                
Outstanding options, additional disclosures [Abstract]                
Estimated grant-date fair value (in dollars per share)   $ 3.81            
Derived service period   1 year 10 months 13 days            
Maximum [Member]                
Outstanding options, additional disclosures [Abstract]                
Estimated grant-date fair value (in dollars per share)   $ 3.99            
Derived service period   4 years 6 months 7 days            
President and Chief Executive Officer [Member]                
Outstanding options, number of shares [Roll Forward]                
Granted (in shares)   250,000            
Outstanding options, additional disclosures [Abstract]                
Stock options granted (in shares)   250,000            
Reversal of previously recorded stock based compensation expense $ 500,000              
Stock-based compensation expense     $ 193,000          
Key Executives [Member]                
Outstanding options, number of shares [Roll Forward]                
Granted (in shares)   37,500            
Outstanding options, additional disclosures [Abstract]                
Stock options granted (in shares)   37,500