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Share-based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Compensation expense	$ 400	$ 500	$ 900	$ 1,000
Granted, shares			257,000
Shares withheld for tax requirements			64,573
Tax withholding payments for share-based compensation			$ 97	221
Common Stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing stock price per share	$ 1.85		$ 1.85
Tax withholding payments for share-based compensation				$ 1
Share Option Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum expiration period of share based payment awards granted			10 years
Granted, shares			257,000	243,800
Weighted-average grant-date fair value per share			$ 1.25	$ 1.36
Unrecognized compensation expense	$ 600		$ 600
Weighted-average period of recognition			2 years 10 months 24 days
Share Option Awards [Member] | Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights (as percentage)			25.00%
Performance Shares [Member] | Share-based Compensation Award, Tranche One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights (as percentage)			25.00%
Performance Shares [Member] | Share-based Compensation Award, Tranche One [Member] | Non-Employee Directors [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting rights (as percentage)			100.00%
Nonvested Share Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average period of recognition			2 years 7 months 6 days
Fair value of nonvested share awards			$ 400	$ 600
Issuance of nonvested share awards, Shares			321,600	308,584
Weighted-average grant-date fair value per share, granted			$ 1.69	$ 3.34
Unrecognized compensation expenses	1,900		$ 1,900
Nonvested Share Unit Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted-average period of recognition			10 months 24 days
Fair value of nonvested share awards			$ 200	$ 200
Issuance of nonvested share awards, Shares			40,000	72,464
Weighted-average grant-date fair value per share, granted			$ 2.28	$ 2.07
Unrecognized compensation expenses	$ 100		$ 100
2019 Equity Incentive Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for future grant	2,463,795		2,463,795

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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