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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands		12 Months Ended
	Jan. 01, 2019 USD ($)	Dec. 31, 2018 Customer	Dec. 31, 2017 USD ($) Customer
Schedule Of Accounting Policies [Line Items]
Refinancing of outstanding loans used as working capital			$ 1,000
Estimated liquidity period		12 months
ASU 2016-02 | Minimum | Subsequent Event
Schedule Of Accounting Policies [Line Items]
Increase to assets and liabilities	$ 600
ASU 2016-02 | Maximum | Subsequent Event
Schedule Of Accounting Policies [Line Items]
Increase to assets and liabilities	$ 800
Customer Concentration Risk | Net Revenue
Schedule Of Accounting Policies [Line Items]
Number of Customers | Customer		2	0
Customer accountability percentage		23.00%
Credit Concentration Risk | Net Accounts Receivable-Trade
Schedule Of Accounting Policies [Line Items]
Number of Customers | Customer		2	3
Customer accountability percentage		56.00%	53.00%

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