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Commitments and Contingencies - Additional Information (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2017
USD ($)
ft²
Schedule Of Commitments And Contingencies [Line Items]  
Change in warranty reserve for disclosure purposes only $ 2.9
Minimum [Member]  
Schedule Of Commitments And Contingencies [Line Items]  
Warranty period 10 years
Maximum [Member]  
Schedule Of Commitments And Contingencies [Line Items]  
Warranty period 25 years
Surface Flaking Warranty Reserve [Member]  
Schedule Of Commitments And Contingencies [Line Items]  
Percentage change in warranty claims used as a threshold for disclosure 10.00%
Sublease [Member]  
Schedule Of Commitments And Contingencies [Line Items]  
Net minimum receipts remaining under the Company's existing subleases for 2017 $ 0.3
Net minimum receipts remaining under the Company's existing subleases for 2018 1.3
Net minimum receipts remaining under the Company's existing subleases for 2019 $ 0.7
Contract Termination [Member]  
Schedule Of Commitments And Contingencies [Line Items]  
Lease square feet | ft² 55,047
Minimum payments, 2017 $ 0.5
Minimum payments, 2018 2.0
Minimum payments, 2019 $ 1.0