Annual report pursuant to Section 13 and 15(d)

Selected Balance Sheet Data - Schedule of Other Assets (Parenthetical) (Detail)

v3.6.0.2
Selected Balance Sheet Data - Schedule of Other Assets (Parenthetical) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Assets [Line Items]      
Weighted average interest rate for notes receivable 3.30% 2.90%  
Allowance of doubtful accounts $ 313 $ 359  
Provision for bad debt expense 47 281 $ 29
Write-off receivables $ 93 $ 115 $ 59
Minimum [Member]      
Other Assets [Line Items]      
Notes receivable due period 1 year    
Maximum [Member]      
Other Assets [Line Items]      
Notes receivable due period 5 years