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Loans Payable (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 02, 2020
USD ($)
Mar. 01, 2020
USD ($)
Sep. 30, 2014
USD ($)
tranche
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2015
$ / shares
shares
Long Term Debt              
Interest expense       $ 29 $ 353    
Loan and security agreement              
Long Term Debt              
Maximum amount available     $ 35,000        
Debt number of tranches | tranche     3        
Gross proceeds   $ 3,200       $ 3,167  
Final fee payment $ 1,900 $ 1,900          
Final payment fee percentage 6.60%            
Interest expense       $ 20 $ 200    
Debt discount and debt issuance costs     $ 1,000        
Term Loan A | Common Stock | Warrants              
Long Term Debt              
Number of shares that can be purchased upon exercise of warrants (in shares) | shares     7,678 5,728      
Exercise price | $ / shares     $ 5.8610        
Term Loan B | Common Stock | Warrants              
Long Term Debt              
Number of shares that can be purchased upon exercise of warrants (in shares) | shares             34,961
Exercise price | $ / shares             $ 10.6190
Term Loan C | Common Stock | Warrants              
Long Term Debt              
Number of shares that can be purchased upon exercise of warrants (in shares) | shares       62,241      
Exercise price | $ / shares       $ 3.6150