Subsequent Events - Exchange Agreement and Fourth Amendment to Facility Agreement (Details)				12 Months Ended
	Feb. 24, 2020 USD ($) $ / shares shares	Apr. 03, 2019 $ / shares	Apr. 01, 2019 USD ($) $ / shares	Dec. 31, 2020 USD ($)	Mar. 04, 2020 USD ($) day $ / shares shares	Dec. 31, 2019 USD ($)
Subsequent Event [Line Items]
Stock trigger price (usd per share) | $ / shares		$ 6.61
Ownership cap						9.50%
Revolving loan facility | Subsequent Event
Subsequent Event [Line Items]
Target liquidity, maturity extension condition				$ 142,500,000.0
Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
Stock trigger price (usd per share) | $ / shares	$ 2.00
Mandatory conversion of shares					$ 40,000,000.0
VWAP Days | day					15
Stock split ratio	100
Target liquidity, financing proceeds	$ 5,000,000
Conversion of debt, related to financing target | $ / shares					$ 0.50
Conversion rate, per proceed unit					$ 1
Aggregate conversion of debt, related to financing target					$ 20,000,000
Debt restructuring fee, value of shares issued	$ 2,000,000.0
Debt restructuring fee, common shares issued (in shares) | shares	950,000
Debt restructuring fee, preferred shares issued (in shares) | shares	14,648.75
Monthly interest payments term	18 months
Weighted average, product for interest payments	90.00%
Deerfield ELGX Revolver, LLC
Subsequent Event [Line Items]
Stock trigger price (usd per share) | $ / shares			$ 6.625
Mandatory conversion of shares			$ 1,666,666
Voluntary conversion amount			$ 50,000,000.0			$ 1,700,000.0
Ownership cap			4.985%
Deerfield ELGX Revolver, LLC | Revolving loan facility
Subsequent Event [Line Items]
Revolving loan facility						$ 0
First Out Waterfall Notes | Amended First Out Waterfall Notes
Subsequent Event [Line Items]
Stock trigger price (usd per share) | $ / shares			$ 6.625
First Out Waterfall Notes | Deerfield ELGX Revolver, LLC | Revolving loan facility | Subsequent Event
Subsequent Event [Line Items]
Percentage of loans for extended due date					8.333%
Revolving loan facility					$ 10,700,000
Discretionary Conversion | Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
Volume weighted average price rate trigger					85.00%
Voluntary conversion amount					$ 60,000,000.0
Series DF-1 Preferred Stock | Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
Volume weighted average price rate trigger					200.00%
Convertible preferred stock, par value (in USD per share) | $ / shares					$ 0.001
Convertible preferred stock, authorized (in shares) | shares					1,105,000
Ownership cap					4.985%
Shares issuable upon conversion | shares					1,430,000
Shares issuable upon conversion, discretionary common conversion rate | shares					1,430,000
Convertible Condition One | Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
Volume weighted average price rate trigger					85.00%
Convertible Condition Two | Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
Volume weighted average price rate trigger					170.00%
Convertible Condition Three | Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
Forced conversion amount, maximum					$ 3,500,000.0
Initial Exchange Condition | Revolving loan facility | Subsequent Event
Subsequent Event [Line Items]
Target liquidity, maturity extension condition				$ 1,000,000.0
Initial Exchange Condition | Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
Exercise price (usd per share) | $ / shares					$ 1.50
Initial Exchange Condition | First Out Waterfall Notes | Revolving loan facility | Subsequent Event
Subsequent Event [Line Items]
Conversion price (USD per share) | $ / shares					$ 0.8282
Initial Exchange Condition | First Out Waterfall Notes | Deerfield ELGX Revolver, LLC | Revolving loan facility | Subsequent Event
Subsequent Event [Line Items]
Percentage of loans for extended due date					8.333%
Revolving loan facility					$ 10,700,000
Nellix Submission Exchange | Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
VWAP Days | day					15
Volume weighted average price rate trigger					85.00%
Debt conversion, converted instrument, amount	$ 2,500,000
Nellix Approval Exchange Condition | Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
Debt conversion, converted instrument, amount	7,500,000
Nellix Approval Exchange | Amended First Out Waterfall Notes | Subsequent Event
Subsequent Event [Line Items]
Target liquidity, net sales	$ 10,000,000