Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)		3 Months Ended
	Jan. 02, 2019	Mar. 31, 2019	Jan. 01, 2019
Subsidiary, Sale of Stock [Line Items]
Cash equivalents maturities, term		three months or less
Operating Lease, Right-of-Use Asset		$ 51,000
Operating Lease, Weighted Average Discount Rate, Percent			10.00%
Operating Lease, Payments	$ 112,000	$ 56,000
Previously Reported [Member]
Subsidiary, Sale of Stock [Line Items]
Operating Lease, Liability			$ 8,000
Accounting Standards Update 2016-02 [Member]
Subsidiary, Sale of Stock [Line Items]
Operating Lease, Right-of-Use Asset			101,000
Operating Lease, Liability			$ 109,000
Increase In Lease Liabilities	$ 101,000