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Commitments and Contingencies - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Oct. 10, 2018
USD ($)
ft²
Commitments and Contingencies Disclosure [Abstract]      
Operating lease, term of contract 7 years   7 years
Area of real estate property | ft²     42,685
Collateralized agreements     $ 1,480
Rental expenses $ 1,596 $ 1,728  
Capital lease obligations $ 747