Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.10.0.1
Commitments and Contingencies - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Loss Contingencies [Line Items]          
Operating lease beginning date     Mar. 01, 2014    
Operating lease ending date     Jul. 31, 2019    
Sub-lease annual rental income     $ 71,000    
Accrued costs of Settlement Agreement $ 100,000   100,000   $ 505,000
Reimburse to Plaintiff's opposing counsel     99,000    
Reversal of accrued costs of Settlement Agreement 405,000   405,000    
Insurance reimbursement 405,000 $ (505,000) 405,000 $ (505,000)  
Insurance Reimbursement for Professional Fees [Member]          
Loss Contingencies [Line Items]          
Insurance reimbursement $ 200,000   200,000    
Business Law Group [Member]          
Loss Contingencies [Line Items]          
Annual rental income     $ 168,000