Quarterly report pursuant to Section 13 or 15(d)

Forgivable Loans Receivable - Additional Information (Detail)

v3.8.0.1
Forgivable Loans Receivable - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2006
Notes, Loans and Financing Receivable, Net, Current $ 1,534 $ 1,616 $ 200
Forgivable Loan Receivable [Member]      
Debt Instrument, Interest Rate, Stated Percentage 4.00%