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Credit Facility - Additional Information (Detail)
$ in Millions
Dec. 10, 2018
patent
Feb. 16, 2018
Nov. 14, 2017
patent
Feb. 27, 2018
USD ($)
Mar. 22, 2013
USD ($)
Line of Credit Facility [Line Items]          
Line of credit, available borrowings       $ 200.0 $ 50.0
Current borrowing capacity       $ 50.0 $ 10.0
Base rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate   0.50%      
Base rate | Minimum          
Line of Credit Facility [Line Items]          
Basis spread on variable rate   0.25%      
Base rate | Maximum          
Line of Credit Facility [Line Items]          
Basis spread on variable rate   0.75%      
LIBOR rate          
Line of Credit Facility [Line Items]          
Basis spread on variable rate   1.00%      
LIBOR rate | Minimum          
Line of Credit Facility [Line Items]          
Basis spread on variable rate   1.25%      
LIBOR rate | Maximum          
Line of Credit Facility [Line Items]          
Basis spread on variable rate   1.75%      
Lawsuit against 3Shape A/S          
Line of Credit Facility [Line Items]          
Patents allegedly infringed upon | patent 10   26