Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Revenue	$ 5,313	$ 3,872
Cost of sales	7,639	3,843
Gross profit (loss)	(2,326)	29
Operating expenses:
Research and development	14,010	8,408
Sales and marketing	2,635	1,843
General and administrative	10,273	4,613
Total operating expenses	26,918	14,864
Loss from operations	(29,244)	(14,835)
Change in fair value of warrant liabilities	(46,649)	(309)
Interest expense and other	(200)	(532)
Interest income and other	170	95
Total other income (expense), net	(46,679)	(746)
Net loss	(75,923)	(15,581)
Net loss attributable to common stockholders	$ (75,923)	$ (15,581)
Net loss per share attributable to common stockholders:
Basic and diluted (in dollars per share)	$ (0.23)	$ (0.12)
Shares used in computing net loss per share attributable to common stockholders:
Basic and diluted (in shares)	332,987,523	128,668,864
Comprehensive Loss:
Net loss	$ (75,923)	$ (15,581)
Net unrealized gains (losses) on available-for-sale debt securities	(43)	(7)
Comprehensive loss	$ (75,966)	$ (15,588)