Organization and Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | segment		2
Warranty period		1 year
Corporate owned life insurance policies fair value	$ 4,020	$ 4,020	$ 3,596
Restricted cash balance	658	658	661
Prepaid Expenses and Other Current Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash balance	900	900	900
Other Current Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash balance	700	$ 700	$ 700
Enterprise Resource Planning System
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment charges	1,300
Design of New Headquarters
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment charges	$ 700