Derivatives - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	May 28, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) shares	Jan. 27, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jul. 20, 2020 USD ($) $ / shares	Apr. 06, 2020 USD ($) $ / shares shares	Oct. 31, 2019 USD ($)
Derivative [Line Items]
Remeasured derivative liability					$ 0		$ 7,507
Reverse stock split, conversion ratio	0.10
Derivative liability	$ 6,300	$ 5,600		$ 5,600
Mark-to-market loss recognized		3,500		3,500
Pre-reverse stock split shares (in shares) | shares					538,995					538,995
Exercise price (dollars per share) | $ / shares									$ 0.01	$ 0.01
Estimated fair value of the warrants	$ 2,200								$ 300	$ 1,400
(Level 3) | Derivative Liability
Derivative [Line Items]
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value					$ 0		7,507
Revolving Credit Facility | Line of Credit | (Level 3) | Derivative Liability
Derivative [Line Items]
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value		$ 5,600	$ 5,300	$ 5,600
2023 Series D Convertible Notes | Convertible Notes Payable | (Level 3) | Derivative Liability
Derivative [Line Items]
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability value					$ 0	$ 10,700	$ 7,507	$ 5,500
2023 Series A Unsecured Convertible Notes for Series B Senior Unsecured Convertible Notes
Derivative [Line Items]
Derivative liability											$ 13,500
Fair value of embedded derivative liability											$ 2,000
Remeasured derivative liability			2,800
Gain on change in fair value of derivative			$ 4,000