Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional Information (Detail)

v3.19.3
Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Tax Disclosure [Abstract]        
Liability for unrecognized tax benefit, including related estimates of penalties and interest $ 0 $ 0 $ 0 $ 0
Income tax provision (benefit) $ 26,000 $ 49,000 $ 68,000 $ 91,000
Projected annual effective tax rate 0.02% 0.50% 0.30% 0.60%
Statutory tax rate     21.00%