Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Total revenues, net	$ 33,311	$ 27,185	$ 63,146	$ 50,155
Costs and expenses:
Cost of goods sold	3,741	6,177	10,521	12,877
Selling, general, and administrative	28,149	34,542	59,673	67,140
Research and development	19,558	17,967	44,732	35,858
Total costs and expenses	51,448	58,686	114,926	115,875
Loss from operations	(18,137)	(31,501)	(51,780)	(65,720)
Other expense, net	(1,186)	(7,169)	(2,741)	(14,883)
Loss before income taxes	(19,323)	(38,670)	(54,521)	(80,603)
Income tax expense	48	18	741	49
Net loss	$ (19,371)	$ (38,688)	$ (55,262)	$ (80,652)
Net loss per common share—basic (in dollars per share)	$ (0.41)	$ (0.84)	$ (1.16)	$ (1.75)
Net loss per common share—diluted (in dollars per share)	$ (0.41)	$ (0.84)	$ (1.16)	$ (1.75)
Weighted average number of common shares outstanding—basic (in shares)	47,564,283	46,197,656	47,542,287	46,153,613
Weighted average number of common shares outstanding—diluted (in shares)	47,564,283	46,197,656	47,542,287	46,153,613
Net loss	$ (19,371)	$ (38,688)	$ (55,262)	$ (80,652)
Unrealized (loss) gain on available-for-sale investments, net	(363)	3	(667)	(9)
Comprehensive loss	$ (19,734)	$ (38,685)	$ (55,929)	$ (80,661)
Revenue from Contract with Customer, Product and Service [Extensible Enumeration]			Product [Member]