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Leases - Narrative (Details)
ft² in Thousands, $ in Thousands
 1 Months Ended 3 Months Ended
Mar. 31, 2020
USD ($)
Aug. 31, 2019
ft²
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]          
Long-term lease liabilities $ 6,390   $ 6,390   $ 6,729
Operating lease, liability 4,600   4,600    
Finance lease, right of use asset 5,400   5,400    
Operating lease, right of use asset 4,358   4,358   $ 5,073
Operating lease, expense     1,200 $ 1,200  
Amortization of right-of-use assets     514 536  
Square feet under lease | ft²   0      
Operating lease liability, adjustments $ 100        
General and Administrative Expense          
Lessee, Lease, Description [Line Items]          
Operating lease, expense     200 100  
Consumables          
Lessee, Lease, Description [Line Items]          
Operating lease, expense     $ 1,000 $ 1,100