Outstanding Debt - Schedule of Senior Convertible Note Estimated Fair Value (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair Value - Beginning	$ 8,139	$ 7,903
Face value principal - issue date	18,861	7,000
Fair value adjustment at issue date	1,439	(648)
Installment repayments - common stock	(14,736)	(6,059)
Non-installment repayments - common stock	(470)	(199)
Non-installment repayments - cash	(600)	(365)
Change in fair value	2,027	507
Lender Fee
Fair Value - Ending	14,660	8,139
Other Income (Expense) [Member]
Fair value adjustment at issue date	(1,439)
Change in fair value	(2,027)
Other Income (Expense) - Change in fair value - Senior Secured Convertible Notes and Senior Convertible Notes	(5,327)
December 2018 Senior Secured Convertible Note [Member]
Fair Value - Beginning	1,700	7,903
Face value principal - issue date
Fair value adjustment at issue date
Installment repayments - common stock	(1,692)	(6,059)
Non-installment repayments - common stock	(6)	(199)
Non-installment repayments - cash		(279)
Change in fair value	(2)	334
Fair Value - Ending		1,700
November 2019 Senior Secured Convertible Notes [Member]
Fair Value - Beginning	6,439
Face value principal - issue date	7,000	7,000
Fair value adjustment at issue date	2,600	(648)
Installment repayments - common stock	(13,044)
Non-installment repayments - common stock	(464)
Non-installment repayments - cash	(138)	(86)
Change in fair value	(1,123)	173
Fair Value - Ending	1,270	6,439
April 2020 Senior Convertible Notes [Member]
Fair Value - Beginning
Face value principal - issue date	4,111
Fair value adjustment at issue date	(411)
Installment repayments - common stock
Non-installment repayments - common stock
Non-installment repayments - cash	(216)
Change in fair value	1,116
Lender Fee
Fair Value - Ending	4,600
April 2020 Senior Convertible Notes [Member] | Other Income (Expense) [Member]
Lender Fee	(411)
August 2020 Senior Secured Convertible Notes [Member]
Fair Value - Beginning
Face value principal - issue date	7,750
Fair value adjustment at issue date	(750)
Installment repayments - common stock
Non-installment repayments - common stock
Non-installment repayments - cash	(246)
Change in fair value	2,036
Lender Fee
Fair Value - Ending	8,790
August 2020 Senior Secured Convertible Notes [Member] | Other Income (Expense) [Member]
Lender Fee	(750)
November 2019 Senior Secured Convertible Note Series B [Member] | Other Income (Expense) [Member]
Lender Fee	$ (700)
Other Income (Expense) [Member]
Fair value adjustment at issue date		648
Change in fair value		(507)
Lender Fee		(700)
Other Income (Expense) - Change in fair value - Senior Secured Convertible Notes and Senior Convertible Notes		$ (559)