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Related Party Transactions - Additional Information (Detail) - Officer - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Consulting          
Related Party Transaction [Line Items]          
Transaction expenses incurred by parent company $ 29,000 $ 69,000 $ 73,000 $ 97,000  
Outstanding payables due to related party 16,000   16,000   $ 12,000
Software Licensing and Subscription          
Related Party Transaction [Line Items]          
Quarterly software licensing fee     200,000   200,000
Deferred costs related to annual software subscription $ 146,000   $ 146,000   $ 50,500