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Outstanding Debt - Interest expenses (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Apr. 09, 2021
USD ($)
Mar. 01, 2021
Apr. 30, 2021
loan
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Total interest expense       $ 807 $ 1,059 $ 2,254 $ 1,684
Notes [Member]              
Total interest expense       700 1,100 2,100 $ 1,700
Amortization of debt discount       $ 200 $ 700 1,400  
Amortization of Debt Issuance Costs           $ 1,100  
Debt Instrument, Term.   22 months          
Paycheck Protection Program [Member]              
Number of Additional Loans | loan     2        
Proceeds from Issuance of Debt $ 400            
Debt Instrument, Term.     5 years        
Debt Instrument, Deferred Term     10 months