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Long-term Debt - Additional Information (Detail) - USD ($)
6 Months Ended
Apr. 20, 2020
Jun. 30, 2020
Dec. 28, 2019
Jun. 29, 2018
Long-term debt   $ 35,000,000 $ 35,000,000  
Interest rate effective percentage   10.00%    
Prepayment percentage   3.00%    
Average effective interest rate   11.70%    
In Event Of Default [Member]        
Increasing applicable margin   4.00%    
Paid In Kind [Member]        
Paid in kind interest threshold   11.50%    
Maximum [Member]        
Prepayment premium percentage   9.00%    
Maximum [Member] | Paid In Kind [Member]        
Interest rate   12.50%    
Orbi Med [Member]        
Long-term debt       $ 35,000,000
Basis spread on variable rate   8.50%    
Description of covenants   The covenants include maintaining a minimum liquidity amount of $3.0 million; the requirement, on an annual basis, to deliver to OrbiMed annual audited financial statements with an unqualified audit opinion from the Company’s independent registered public accounting firm; and restrictions on the Company’s activities, including limitations on dispositions, mergers or acquisitions; encumbering its intellectual property; incurring indebtedness or liens; paying dividends; making certain investments; and engaging in certain other business transactions.    
Minimum liquidity covenant amount   $ 3,000,000    
Orbi Med [Member] | Credit Agreement [Member]        
Debt instrument, maturity month and year   2023-06    
Orbi Med [Member] | Minimum [Member]        
LIBOR rate   1.00%    
Orbi Med [Member] | Maximum [Member]        
LIBOR rate   4.00%    
Interest rate effective percentage   11.50%    
Bank of America [Member] | Promissory Note [Member] | Paycheck Protection Program [Member]        
Loan proceeds $ 2,200,000      
Repayment date May 01, 2020      
Maturity date Apr. 20, 2022      
Fixed interest rate 1.00%