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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowance	$ 746	$ 462
Product warranty, measured at fair value, current	10,163	8,267
Product warranty, measured at fair value, noncurrent	$ 23,156	$ 20,469
Common stock, par value (in usd per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	135,691,000	128,962,000
Common stock, shares outstanding (in shares)	135,691,000	128,962,000

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