Nature of Business, Liquidity, Basis of Presentation and Summary of Significant Accounting Policies - Liquidity (Additional Information) (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 31, 2018	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]
Current portion of debt			$ 337,583,000	$ 29,848,000
Repayments of principal in next twelve months			353,500,000
Revenue related to sales-type leases			2,900,000	3,400,000	$ 4,000,000
ITC recaptured amount			$ 0	$ 0	$ 0
Interest rate percentage			6.00%
IPO
Subsidiary, Sale of Stock [Line Items]
Shares sold in offering (in shares)	20,700,000
Class A common stock
Subsidiary, Sale of Stock [Line Items]
Common stock, authorized (in shares)			600,000,000	600,000,000
Class B common stock
Subsidiary, Sale of Stock [Line Items]
Common stock, authorized (in shares)			600,000,000	600,000,000
Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse, Amendment
Subsidiary, Sale of Stock [Line Items]
Convertible stock price (in dollars per share)			$ 8
Subsequent Event
Subsidiary, Sale of Stock [Line Items]
Current portion of debt		$ 70,000,000
Subsequent Event | Convertible promissory notes | Convertible Promissory Notes Interest Rate 6% Due December 2020, Recourse, Amendment
Subsidiary, Sale of Stock [Line Items]
Interest rate percentage		10.00%
Subsequent Event | Senior secured notes | Senior Notes Due 2027
Subsidiary, Sale of Stock [Line Items]
Debt face amount		$ 70,000,000
Interest rate percentage		10.25%
Subsequent Event | Convertible debt | Additional Convertible Notes
Subsidiary, Sale of Stock [Line Items]
Debt face amount		$ 30,000,000
Funding used for repayment		100.00%