Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) segment revenue_source customer	Dec. 31, 2020 USD ($) customer	Dec. 31, 2019 USD ($)	Jan. 01, 2021 USD ($)
Summary of Significant Accounting Policies [Line Items]
Advertising expense	$ 13,700,000	$ 19,300,000
Number of operating segments | segment	1
Impairment losses	$ 0
Number revenue sources | revenue_source	2
Total Revenues	$ 78,447,000	227,547,000	$ 148,364,000
Convertible notes, net of issuance costs	258,280,000	179,367,000
Accumulated deficit	1,106,377,000	838,817,000
Additional paid-in capital	(964,401,000)	$ (797,655,000)
Restricted cash	$ 50,000,000
Trade Accounts Receivable | Customer Concentration Risk
Summary of Significant Accounting Policies [Line Items]
Number of major customers | customer	9	8
Adoption of new accounting pronouncement
Summary of Significant Accounting Policies [Line Items]
Convertible notes, net of issuance costs				$ 92,000,000
Accumulated deficit				1,500,000
Additional paid-in capital				$ 93,500,000
Product
Summary of Significant Accounting Policies [Line Items]
Total Revenues	$ 40,047,000	$ 12,965,000	$ 0
Minimum | Property and equipment
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	3 years
Maximum | Property and equipment
Summary of Significant Accounting Policies [Line Items]
Estimated useful lives	10 years