Notes Payable, Preferred Stock and Stock Purchase Warrants (Details)								6 Months Ended
	Jan. 01, 2022 USD ($) shares	Jan. 31, 2021 USD ($) $ / shares shares	Jan. 21, 2021 USD ($) $ / shares shares	Nov. 09, 2020 USD ($) $ / shares	Aug. 09, 2020 USD ($) $ / shares shares	Apr. 24, 2020 USD ($) $ / shares shares	Apr. 22, 2020 USD ($)	Jun. 30, 2022 USD ($) $ / shares shares	Jun. 30, 2021 USD ($)	Apr. 30, 2022	Dec. 31, 2021 USD ($) $ / shares	May 09, 2021 $ / shares shares	Dec. 31, 2020 USD ($)	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Loss on extinguishment									$ (3,183,000)
Notes payable
Derivative assets								$ 1,085,000			$ 239,000
Carrying Amount								50,650,000			59,798,000
Derivative liabilities								$ 54,737,000			$ 236,291,000
Common stock, par value per share (in dollars per share) | $ / shares								$ 0.001			$ 0.001
Exchange Agreement with Highbridge
Debt Instrument [Line Items]
Warrants to purchase shares | shares						4,500,000
Exercise price of warrant (in dollars per share) | $ / shares						$ 0.66
Notes payable
Shares issued | shares						11,026,086
Accrued and unpaid interest						$ 300,000
2023 Notes.
Notes payable
Fair value of the embedded conversion option								$ 400,000			$ 5,800,000
Derivative liabilities														$ 17,300,000
PHC Notes
Notes payable
Principal amount					$ 35,000,000.0			35,000,000			35,000,000
Interest rate (as a percent)					9.50%					8.00%
Carrying Amount								17,661,000			15,277,000
Debt issuance costs and discounts					$ 1,400,000
Fair value of the embedded conversion option					$ 25,800,000			$ 46,800,000			149,100,000
Effective Interest Rate								8.00%	9.50%
Original debt conversion amount								$ 0
Financing fee shares issued | shares					2,941,176
Common stock, par value per share (in dollars per share) | $ / shares					$ 0.001
Debt discount of financing fee shares					$ 1,500,000
Conversion rate					1,867.4136
Conversion price | $ / shares					$ 0.54
Conversion of Stock, Amount Issued					$ 15,000,000.0
Issuance costs incurred					2,900,000			998,000			1,136,000
Amount of principal which is converted to shares					$ 1,000
PHC Notes | Debt Redemption on or After October 31, 2022
Notes payable
Threshold percentage of stock trigger					275.00%
Notice period					10 days
PHC Notes | Debt Redemption on or After October 31, 2023
Notes payable
Notice period					10 days
PHC Notes | Debt Redemption Six Months Prior to Maturity Date
Notes payable
Call premium percentage					130.00%
PHC Notes | Debt Redemption Within Six Months of Maturity Date
Notes payable
Call premium percentage					125.00%
2025 Notes
Notes payable
Fair value of the embedded conversion option								$ 8,000,000			81,400,000
2025 Notes | Exchange Agreement with Highbridge
Notes payable
Principal amount						24,000,000.0
Deferred issuance costs and debt discounts						13,200,000
PPP Loan
Notes payable
Amount received from loan funding							$ 5,800,000
Principal amount											2,926,000
Interest rate (as a percent)							1.00%
Note term							2 years
Carrying Amount											2,926,000
Effective Interest Rate								1.00%	1.00%
PPP Loan | Silicon Valley Bank
Notes payable
Principal amount							$ 5,800,000
Second Lien Notes | Exchange Agreement with Highbridge
Notes payable
Principal amount						$ 15,700,000
PHC Option | Put option
Notes payable
Derivative assets								$ 1,100,000			200,000
PHC Option | Put option | Maximum
Notes payable
Gain on fair value adjustment of derivatives								900,000
Energy Capital Facility
Debt Instrument [Line Items]
Exercise price of warrant (in dollars per share) | $ / shares												$ 0.3951
Notes payable
Deferred issuance costs and debt discounts													$ 7,600,000
Period to purchase stock				24 months
Derivative liabilities				$ 4,200,000				$ 19,500,000			$ 69,400,000
Energy Capital Facility | Maximum
Debt Instrument [Line Items]
Warrants to purchase shares | shares												10,000,000
Notes payable
Share price for debt conversion | $ / shares			$ 0.25
Cash Cash Equivalents and Other Available Credit Threshold			$ 8,000,000
Series B Preferred Stock
Notes payable
Number of shares sold pursuant to regular purchases | shares	0
Maximum amount of shares that can be purchased under the equity line agreement at purchase price	$ 12,000,000.0
Series B Preferred Stock | Energy Capital Facility
Notes payable
Preferred stock value				$ 12,000,000.0
Share price for debt conversion | $ / shares			$ 1,000
Number of shares sold pursuant to regular purchases | shares			0
Maximum amount of shares that can be purchased under the equity line agreement at purchase price			$ 12,000,000.0
Period to purchase stock			6 months
Daily limit			$ 4,000,000.0
Conversion price | $ / shares				$ 0.3951
Series A Preferred Stock
Notes payable
Debt converted, Shares issued | shares								25,783
Gain on extinguishment								$ 3,500,000
Series A Preferred Stock | Masters Capital
Notes payable
Shares issued | shares		22,783
Conversion price | $ / shares		$ 0.476
Amount of principal which is converted to shares		$ 1,000
Number of shares issued and sold | shares					3,000
Price per share (in dollars per share) | $ / shares		$ 1,000			$ 1,000
Additional shares issued | shares		22,783
Gross proceeds from stock		$ 22,800,000
Series A Preferred Stock | Masters Capital | Maximum
Notes payable
Shares issued | shares					27,000
Number of shares issued and sold | shares					27,000