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Long-term Debt - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 29, 2018
Long-term debt   $ 35,000 $ 35,000  
Orbi Med [Member]        
Long-term debt       $ 35,000
Description of variable rate basis   London Interbank Offered Rate (“LIBOR”), subject to a minimum of 1.0% and a maximum of 4.0%    
Basis spread on variable rate   8.50%    
Interest rate effective percentage   9.50%    
Prepayment premium percentage   4.50%    
Final payment   3.00%    
Description of covenants   The financial 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    
Average effective interest rate   11.20%    
Orbi Med [Member] | Credit Agreement [Member]        
Debt instrument, maturity month and year   2023-06    
Orbi Med [Member] | Scenario Forecast [Member]        
Prepayment premium percentage 0.00%      
Orbi Med [Member] | In Event Of Default [Member]        
Increasing applicable margin   4.00%    
Orbi Med [Member] | Minimum [Member]        
Paid in kind interest threshold   11.50%    
Orbi Med [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR)        
LIBOR rate   1.00%    
Orbi Med [Member] | Maximum [Member]        
Interest rate effective percentage   11.50%    
Paid in kind interest threshold   12.50%    
Orbi Med [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR)        
LIBOR rate   4.00%