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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 

   
Schedule of fair value on a recurring basis and indicates the fair value hierarchy of the valuation inputs
      December 31, 
(In thousands)  Level  2020   2019 
Public Warrants  1  $
—
   $16,119 
Sponsor Warrants  3   92,708    7,689 
Incremental Loan Warrants  3   
—
    21,622 

  
Schedule of Level 3 liability activity
(In thousands)  Sponsor Warrants   Incremental Loan Warrants   Total Level 3 Liabilities 
Fair value as of December 31, 2018  $2,673   $—   $2,673 
Initial measurement   —    4,864    4,864 
Fair value transfer to Level 1 measurement   (321)   —    (321)
Change in valuation inputs(1)   5,337    16,758    22,095 
Fair value as of December 31, 2019  $7,689   $21,622   $29,311 
Fair value transfer to Level 1 measurement   (1,275)   —    (1,275)
Fair value of warrants exercised   (3,690)   (81,040)   (84,730)
Change in valuation inputs(1)   89,984    59,418    149,402 
Fair value as of December 31, 2020  $92,708   $—   $92,708