Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in-Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Series Seed Convertible Preferred Stock	Series A Convertible Preferred Stock	Series B Convertible Preferred Stock
Beginning balance at Dec. 31, 2016	$ (123)			$ (123)
Beginning balance, shares at Dec. 31, 2016		9,160,888
Stock-based compensation	32		$ 32
Net loss	(6,771)			(6,771)
Ending balance at Dec. 31, 2017	(6,862)		32	(6,894)
Ending balance, shares at Dec. 31, 2017		9,160,888
Issuance of Series A preferred stock for cash, net of $0.4 million in offering costs							$ 73,491
Issuance of Series A preferred stock for cash, net of $0.4 million in offering costs, shares							42,215,077
Issuance of stock for acquisition	2,875	$ 1	2,874
Temporary equity, issuance of stock for acquisition, shares						20,000,000
Temporary equity, issuance of stock for acquisition						$ 29,200
Issuance of stock for acquisition. shares		1,101,278
Issuance of Series A preferred stock to convert debt and accrued interest, shares							3,499,209
Issuance of Series A preferred stock to convert debt and accrued interest							$ 6,124
Issuance of Series B preferred stock for cash, net of $0.5 million in offering costs								$ 229,552
Issuance of Series B preferred stock for cash, net of $0.5 in offering costs, shares								71,506,513
Vesting of restricted stock	1	$ 1
Vesting of restricted stock, shares		2,369,696
Incremental vesting conditions placed on previously issued common shares		4,580,444
Stock-based compensation	30,947		30,947
Net loss	(146,969)			(146,969)
Other comprehensive income (loss)	(61)				$ (61)
Ending balance at Dec. 31, 2018	(120,069)	$ 2	33,853	(153,863)	(61)
Temporary equity, ending balance, shares at Dec. 31, 2018						20,000,000	45,714,286	71,506,513
Temporary equity, ending balance at Dec. 31, 2018						$ 29,200	$ 79,615	$ 229,552
Ending balance, shares at Dec. 31, 2018		8,051,418
Issuance of common stock in connection with a public offering,net of underwriting discounts,commissions,and offering costs	291,311	$ 2	291,309
Issuance of common stock in connection with a public offering, net of underwriting discounts, commissions, and offering costs, shares		19,837,500
Convertible preferred stock, conversion of convertible preferred stock into common stock, shares						(20,000,000)	(45,714,286)	(71,506,513)
Convertible preferred stock, conversion of convertible preferred stock into common stock						$ (29,200)	$ (79,615)	$ (229,552)
Conversion of convertible preferred stock into common stock, shares		30,493,460
Conversion of convertible preferred stock into common stock	338,367	$ 3	338,364
Vesting of restricted stock, shares		2,833,506
Exercise of stock options	$ 2,045		2,045
Exercise of stock options, shares	419,593	419,593
Stock-based compensation	$ 20,819		20,819
Net loss	(180,307)			(180,307)
Other comprehensive income (loss)	319				319
Ending balance at Dec. 31, 2019	$ 352,485	$ 7	$ 686,390	$ (334,170)	$ 258
Temporary equity, ending balance, shares at Dec. 31, 2019						0	0	0
Ending balance, shares at Dec. 31, 2019		61,635,477