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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of estimated useful lives of the plant and equipment
    Years
Equipment   10
Furniture and fixtures   7
Computer equipment and software   3
Leasehold improvements   1 -16

  
Schedule of sales returns
   Years Ended
December 31,		 
(in thousands)  2020   2019 
Balance at beginning of period  $7,271   $5,457 
Additions that reduced net revenue   50,504    34,390 
Deduction from reserves for current year returns   (49,347)   (32,576)
Balance at end of period  $8,428   $7,271 

  
Schedule of warranty liabilities
   Years Ended
December 31,		 
(in thousands)  2020   2019 
Balance at beginning of period  $4,621   $2,009 
Additions charged to expense for current year sales   6,399    4,185 
Deduction from reserves for current year claims   (2,623)   (1,573)
Balance at end of period  $8,397   $4,621