Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 38,715	$ 14,225	$ 91,059	$ 31,242
Cost of goods sold	3,228	1,510	9,420	3,772
Gross profit	35,487	12,715	81,639	27,470
Operating expenses
Research and development	5,217	1,722	11,863	4,511
Selling, general and administrative	23,080	10,100	58,353	23,328
Total operating expenses	28,297	11,822	70,216	27,839
Income (loss) from operations	7,190	893	11,423	(369)
Other income (expense)
Interest income	208	19	409	66
Interest expense	(251)	(226)	(1,060)	(682)
Change in fair value of warrant liabilities		(320)	(3,317)	(562)
Other expenses	(651)		(651)
Total other expenses	(694)	(527)	(4,619)	(1,178)
Net income (loss) and comprehensive income (loss)	$ 6,496	$ 366	$ 6,804	$ (1,547)
Net income (loss) per share
Basic	$ 0.13	$ 0.06	$ 0.26	$ (0.27)
Diluted	$ 0.12	$ 0.01	$ 0.14	$ (0.27)
Weighted average common shares used to compute net income (loss) per share,
Basic	48,335,443	5,962,665	26,423,681	5,773,263
Diluted	55,355,846	43,911,252	49,940,409	5,773,263