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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Accounts receivable, allowance $ 1,541 $ 462
Product warranty, measured at fair value, current 12,395 8,267
Product warranty, measured at fair value, noncurrent $ 32,905 $ 20,469
Common stock, par value (in usd per share) $ 0.00001 $ 0.00001
Common stock, shares authorized (in shares) 300,000,000 200,000,000
Common stock, shares issued (in shares) 134,848,000 128,962,000
Common stock, shares outstanding (in shares) 134,848,000 128,962,000