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Leases - Additional information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating leases right of use assets $ 3,933,000 $ 3,933,000 $ 4,329,000  
Long-term lease liabilities current portion 1,660,000 1,660,000    
Long-term lease liabilities non current portion 2,392,000 2,392,000   $ 102,000
Short-term lease cost $ 480,000 $ 937,000    
Weighted-average remaining lease term 3 years 6 months 3 years 6 months    
Weighted-average discount rate 3.83% 3.83%    
Additional interest factor   1.375%    
Lease liabilities paid $ 42,000 $ 63,000    
ROU assets in exchange for new operating lease liabilities 56,000 462,000    
Lease income $ 214,000 $ 428,000