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 Stockholders' Equity (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 Stockholders' Equity (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
Dec. 31, 2013
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  
Total Stockholder's Equity 50,320 48,521 47,262 46,221 47,262 48,521 50,320 $ 46,452 $ 42,723
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    
Total Stockholder's Equity 51,278 48,998 47,508 46,325 47,508 48,998 51,278    
Adjustments [Member]                  
Error Corrections and Prior Period Adjustments Restatement [Line Items]                  
Net income (loss) (481) (231) (141) (104) (246) (477) (958)    
Total Stockholder's Equity $ (958) $ (477) $ (246) $ (104) $ (246) $ (477) $ (958)