Quarterly report pursuant to Section 13 or 15(d)

Property and Equipment, Net - Additional Information (Details)

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Property and Equipment, Net - Additional Information (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Property and Equipment, Net        
Depreciation and amortization expense $ 8,000 $ 88,000 $ 53,000 $ 243,000