Commitments (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2019 USD ($) item	Dec. 31, 2018 USD ($)
Commitments [Line Items]
Capital expenditures committed, but not yet incurred		$ 2,697,000	$ 1,151,000
Contract period for inventory purchase	2 years
Period for options to extend contract period	4 years
Period of options exercised		1 year
Purchase commitment amount purchased		$ 33,727,000
Minimum [Member]
Commitments [Line Items]
Purchase commitment quantity | item		150,000
Purchase commitment		$ 11,104,000
Maximum [Member]
Commitments [Line Items]
Purchase commitment quantity | item		245,900
Purchase commitment		$ 51,028,000