Summary of Significant Accounting Policies (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Cash, uninsured amount	$ 145,634,000	$ 199,507,000
Loss on sale of equipment	0	0
Revenues	34,631,000	7,065,000
Advertising expense	18,528,000	9,767,000
Prepaid Expenses and Other Current Assets
Disaggregation of Revenue [Line Items]
Restricted cash	21,000	21,000
License
Disaggregation of Revenue [Line Items]
Revenues	$ 4,230,000	$ 0