Organization and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) country customer	Sep. 30, 2019 customer country	Sep. 30, 2020 USD ($) customer country segment	Sep. 30, 2019 customer country	Dec. 31, 2019 USD ($) customer	Mar. 31, 2020 USD ($)
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	$ 4,225		$ 4,225		$ 4,214
Restricted cash balance	59		59		56
Investment in unconsolidated affiliate	4,700		4,700			$ 4,700
Warrants for unconsolidated affiliate	2,588		2,588
Prepaid Expenses and Other Current Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash balance	$ 100		$ 100		$ 100
Net Sales | Geographic Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of countries outside the U.S. representing more than 10% of total net sales | country	0	0	0	0
Net Sales | Customer Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of major customers | customer	0	0	0	0
Accounts and notes receivable and contract assets | Customer Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of major customers | customer			0		0