XML 84 R69.htm IDEA: XBRL DOCUMENT v3.7.0.1
Certain Balance Sheet Accounts - Summary of Allowance for Doubtful Accounts (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]      
Balance, beginning of year $ 153 $ 188 $ 254
Provision for doubtful accounts 150 106 320
Write-offs (163) (141) (386)
Balance, end of year $ 140 $ 153 $ 188