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Shareholder's Equity, Warrants (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 12 Months Ended
Jan. 10, 2017
USD ($)
$ / shares
shares
Nov. 03, 2016
USD ($)
$ / shares
shares
Jul. 31, 2016
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Class of Stock Disclosures [Abstract]            
Proceeds from exercise of warrants         $ 0 $ 1,989
Warrants outstanding         0 0
Change in fair value of warrant liability         0 1,475
Replacement Warrants [Member]            
Class of Stock Disclosures [Abstract]            
Warrants outstanding         $ 500  
Expected Dividend Yield [Member] | Replacement Warrants [Member]            
Class of Stock Disclosures [Abstract]            
Warrants measurement input         0  
Expected Stock Price Volatility [Member] | Replacement Warrants [Member] | Minimum [Member]            
Class of Stock Disclosures [Abstract]            
Warrants measurement input         0.4965  
Expected Stock Price Volatility [Member] | Replacement Warrants [Member] | Maximum [Member]            
Class of Stock Disclosures [Abstract]            
Warrants measurement input         0.5038  
Risk-Free Interest Rate [Member] | Replacement Warrants [Member] | Minimum [Member]            
Class of Stock Disclosures [Abstract]            
Warrants measurement input         0.0195  
Risk-Free Interest Rate [Member] | Replacement Warrants [Member] | Maximum [Member]            
Class of Stock Disclosures [Abstract]            
Warrants measurement input         0.0197  
Expected Warrant Option Life [Member] | Replacement Warrants [Member]            
Class of Stock Disclosures [Abstract]            
Expected warrant option life         5 years  
Series B Convertible Preferred Stock [Member] | Investor Warrants [Member]            
Class of Stock Disclosures [Abstract]            
Warrants issuance cost     $ 0      
Warrants to purchase shares of common stock (in shares) | shares     440      
Exercise price of warrants (in dollars per share) | $ / shares     $ 7,896      
Warrants exercisable period         36 months  
Period warrants became exercisable from closing date         6 months  
Series D Convertible Preferred Stock [Member] | Investor Warrants [Member]            
Class of Stock Disclosures [Abstract]            
Warrants issuance cost $ 0          
Warrants to purchase shares of common stock (in shares) | shares 141          
Exercise price of warrants (in dollars per share) | $ / shares $ 1,512          
Warrants exercisable period         60 months  
Period warrants became exercisable from closing date         6 months  
Series C and D Convertible Preferred Stock [Member] | Investor Warrants [Member]            
Class of Stock Disclosures [Abstract]            
Warrants issuance cost   $ 0        
Warrants to purchase shares of common stock (in shares) | shares   2,522        
Exercise price of warrants (in dollars per share) | $ / shares   $ 1,512        
Adjusted exercise price of warrants (in dollars per share) | $ / shares   $ 1,428        
Warrant Exercise Agreement [Member] | Original Warrants [Member]            
Class of Stock Disclosures [Abstract]            
Proceeds from exercise of warrants       $ 2,000    
Warrants outstanding         $ 0 0
Relinquished amount of warrants           $ 100
Warrant Exercise Agreement [Member] | Replacement Warrants [Member]            
Class of Stock Disclosures [Abstract]            
Warrants to purchase shares of common stock (in shares) | shares       3,105    
Warrant Exercise Agreement [Member] | Replacement Warrants [Member] | Minimum [Member]            
Class of Stock Disclosures [Abstract]            
Exercise price of warrants (in dollars per share) | $ / shares       $ 484.4    
Warrant Exercise Agreement [Member] | Replacement Warrants [Member] | Maximum [Member]            
Class of Stock Disclosures [Abstract]            
Exercise price of warrants (in dollars per share) | $ / shares       $ 1,397.2