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Selected Balance Sheet Data - Schedule of Other Assets (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Other Assets [Line Items] |  |  |  |  |
Allowance of doubtful accounts | $ 303 |  | $ 303 |  | $ 359
Provision for bad debt expense | 12 | $ 48 | 15 | $ 127 |
Write-off receivables | $ 6 | $ 24 | $ 71 | $ 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 |  |

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