Commitments and Contingencies - Textual (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Commitments And Contingencies [Line Items]
Sold receivables amount	$ 9,018,000
Due from unrelated third parties	0
Liabilities recorded for obligations	0
Royalty expense	1,429,000	$ 1,904,000	$ 1,117,000
Purchase commitment, remaining minimum amount committed	$ 97,877,000
Percentage of maximum borrowing capacity of value of eligible securities	70.00%
Available line of credit	$ 91,258,000
Available interest rate on line of credit	3.30%
Minimum [Member]
Commitments And Contingencies [Line Items]
Warranty period	12 months
Maximum [Member]
Commitments And Contingencies [Line Items]
Warranty period	14 months