Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue:
Total revenue, net	$ 11,965	$ 12,153	$ 37,419	$ 31,214
Costs and operating expenses:
Cost, Product and Service [Extensible List]	Product	Product	Product	Product
Cost of product revenue	$ 1,073	$ 1,310	$ 3,528	$ 3,298
Research and development	13,719	12,719	39,919	37,505
Selling and marketing	10,186	9,576	29,390	26,054
General and administrative	8,531	8,077	23,875	24,345
Total costs and operating expenses	33,509	31,682	96,712	91,202
Loss from operations	(21,544)	(19,529)	(59,293)	(59,988)
Other income:
Interest income	285	7	375	27
Interest expense	(1,797)	(1,658)	(5,175)	(4,991)
Change in fair value of derivative liability	(1,133)	23,837	8,598	62,249
Other income (expense), net	1		(1)
Total other income, net	(2,644)	22,186	3,797	57,285
Net (loss) income	$ (24,188)	$ 2,657	$ (55,496)	$ (2,703)
Net (loss) income per share, basic	$ (0.31)	$ 0.03	$ (0.72)	$ (0.04)
Weighted average common shares outstanding, basic	76,975,839	76,552,060	76,829,434	76,317,563
Net (loss) income per share, diluted	$ (0.31)	$ (0.23)	$ (0.73)	$ (0.75)
Weighted average common shares outstanding, diluted	76,975,839	85,446,886	82,598,666	82,086,795
Product
Revenue:
Total revenue, net	$ 11,913	$ 12,153	$ 36,555	$ 31,214
Collaboration revenue
Revenue:
Total revenue, net	$ 52		$ 864