Quarterly report pursuant to Section 13 or 15(d)

Forgivable Loans Receivable - Additional Information (Detail)

v3.10.0.1
Forgivable Loans Receivable - Additional Information (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Notes, Loans and Financing Receivable, Net, Current $ 1,610 $ 500 $ 1,616 $ 500
Forgivable Loan Receivable [Member]        
Debt Instrument, Interest Rate, Stated Percentage 4.00%