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Debt Instruments - Credit Facility (Details) - Second Lien Credit Facility - USD ($)
12 Months Ended
Jul. 08, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt facility, maximum borrowing amount   $ 30,000,000.0
Amount of debt outstanding   $ 20,000,000.0
Extinguishment of debt $ 20,000,000.0  
Line of Credit | Prime Rate    
Debt Instrument [Line Items]    
Basis spread on variable rate   4.25%