Derivatives - Terms and Assumptions in Valuation of Convertible Option of Notes (Details)	May 28, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares	Mar. 31, 2019	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 20, 2020 $ / shares	Apr. 06, 2020 $ / shares	Mar. 31, 2020 USD ($) $ / shares	Oct. 31, 2019 $ / shares
Derivative Instruments, Gain (Loss) [Line Items]
Face amount of the Notes | $				$ 111,882,000	$ 181,580,000
Expected Life in Years						5 years	5 years
Stock price | Warrant
Derivative Instruments, Gain (Loss) [Line Items]
Warrants, measurement input	4.03					2.45	2.70
Volatility | Warrant
Derivative Instruments, Gain (Loss) [Line Items]
Warrants, measurement input	0.790					0.795	0.776
Expected Life in Years | Warrant
Derivative Instruments, Gain (Loss) [Line Items]
Expected Life in Years	4 years 10 months 9 days					5 years	5 years
Discount Rate- Bond Equivalent Yield | Warrant
Derivative Instruments, Gain (Loss) [Line Items]
Warrants, measurement input	0.003					0.003	0.004
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable
Derivative Instruments, Gain (Loss) [Line Items]
Term (years)	2 years 11 months 1 day	3 years 3 months 29 days	3 years 29 days
Face amount of the Notes | $	$ 34,405,000	$ 34,405,000						$ 34,405,000
Debt instrument, convertible, conversion price (in dollars per share)	$ 7.20	$ 7.20						$ 7.20	$ 7.20
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable | Stock price
Derivative Instruments, Gain (Loss) [Line Items]
Measurement input	4.03	4.30						2.80
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable | Risk free rate
Derivative Instruments, Gain (Loss) [Line Items]
Measurement input	0.002	0.016						0.003
Series B Senior Unsecured Convertible Notes | Convertible Notes Payable | Volatility
Derivative Instruments, Gain (Loss) [Line Items]
Measurement input	0.625	0.473						0.550