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Geographical Segment Information - Summary of Revenue Generated in Geographic Regions for Years Indicated (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Segment Reporting Information [Line Items]        
Revenues $ 9,741 $ 16,572 $ 21,217 $ 29,300
Revenues | Geographic Concentration        
Segment Reporting Information [Line Items]        
Revenues $ 9,741 $ 16,572 $ 21,217 $ 29,300
Percentage of Revenues 100.00% 100.00% 100.00% 100.00%
Revenues | United States | Geographic Concentration        
Segment Reporting Information [Line Items]        
Revenues $ 9,267 $ 15,890 $ 20,444 $ 28,436
Percentage of Revenues 95.00% 96.00% 96.00% 97.00%
Revenues | International | Geographic Concentration        
Segment Reporting Information [Line Items]        
Revenues $ 474 $ 682 $ 773 $ 864
Percentage of Revenues 5.00% 4.00% 4.00% 3.00%