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Commitments and Contingencies - Summary of Warranty Accrual Included in Accrued Liabilities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]      
Balance at beginning of period $ 4,242 $ 3,606 $ 4,292
Transfer to Aurora as part of the sale of discontinued operations 0 0 (939)
Accrual for current period warranties 5,470 7,278 7,192
Changes in liability related to pre-existing warranties (92) 3 (35)
Warranty costs incurred (5,707) (6,645) (6,904)
Balance at end of period $ 3,913 $ 4,242 $ 3,606