Annual report pursuant to Section 13 and 15(d)

Corrections to Previously Issued Consolidated Financial Statements - Schedule of Effect of Correction and Other Adjustments on Previously Reported Consolidated Statement of Cash Flow (Detail)

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Corrections to Previously Issued Consolidated Financial Statements - Schedule of Effect of Correction and Other Adjustments on Previously Reported Consolidated Statement of Cash Flow (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net income (loss) $ 1,525 $ 1,138 $ 642 $ (519) $ 122 $ 1,260 $ 2,785 $ 3,357
Deferred income tax expense             1,137 2,588
Accounts receivable             (7,556) $ (5,377)
As Previously Reported [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net income (loss) 2,006 1,369 783 (415) 368 1,737 3,743  
Deferred income tax expense             1,763  
Accounts receivable             (9,140)  
Adjustments [Member]                
Error Corrections and Prior Period Adjustments Restatement [Line Items]                
Net income (loss) $ (481) $ (231) $ (141) $ (104) $ (246) $ (477) (958)  
Deferred income tax expense             (626)  
Accounts receivable             $ 1,584