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Business Combination - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Jun. 17, 2015
Jan. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Mar. 31, 2017
Business Acquisition [Line Items]          
Common stock, par value (in dollars per share)       $ 0.001 $ 0.001
Business combination, escrow fund date May 2019        
Goodwill       $ 2,863 $ 2,725
IDchecker          
Business Acquisition [Line Items]          
Acquisition date Jun. 17, 2015        
Total consideration paid $ 5,900        
Cash payment for consideration 5,600        
Business combination consideration transfer, promissory notes 300        
Common stock issued during acquisition, value $ 2,700        
Common stock, par value (in dollars per share) $ 0.001        
Common stock issued during acquisition (in shares) 712,790        
Business combination, paid earnout shares issued (in shares)   137,306 137,306 55,297  
Cash payment to escrow fund related to business acquisition $ 1,800        
Business combination, percentage of closing shares in escrow fund (as a percent) 20.00%        
Business combination, deposited earnout shares in escrow fund (in shares)   27,461      
Goodwill $ 2,873