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Income Taxes - Schedule of Reconciliation of Effective Income Tax Amount (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Amount [Abstract]          
Income tax benefit using U.S. federal statutory rate     $ 1,005   $ 2,328
State Income Tax Expense     (30)   0
Non-deductible expenses     (10)   17
Impact of change in statutory rate          
Change in valuation allowance     (683)   (2,311)
RTP/Other Adjustments     (320)   (34)
Provision for income taxes $ (38) $ 0 $ (38) $ 0 $ 0