Outstanding Debt (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Summary of Outstanding Debt

The fair value and face value principal of outstanding convertible notes as of December 31, 2020 and 2019 are as follows:

	Contractual Maturity Date	Stated Interest Rate			Conversion Price per Share		Face Value Principal Outstanding		Fair Value
November 2019 Senior Secured Convertible Note	September 30, 2021		7.875	%	$	1.60	$	956	$	1,270
April 2020 Senior Convertible Note	April 30, 2022		7.875	%	$	5.00	$	4,111	$	4,600
August 2020 Senior Secured Convertible Note	August 6, 2022		7.875	%	$	5.00	$	7,750	$	8,790
Balance as of December 31, 2020							$	12,817	$	14,660
December 2018 Senior Secured Convertible Note	December 31, 2020		7.875	%	$	1.60	$	1,692	$	1,700
November 2019 Senior Secured Convertible Note	September 30, 2021		7.875	%	$	1.60	$	7,000	$	6,439
Balance as of December 31, 2019							$	8,692	$	8,139

Schedule of Senior Convertible Note Estimated Fair Value

A reconciliation of the fair value of the convertible notes for the years ended December 31, 2020 and 2019 is as follows:

	December 2018 Senior Secured Convertible Note			November 2019 Senior Secured Convertible Notes(1)(2)			April 2020 Senior Convertible Note			August 2020 Senior Secured Convertible Note			Sum of Balance Sheet Fair Value Components			Other Income (Expense)
Fair Value - December 31, 2019	$	1,700		$	6,439		$	—		$	—		$	8,139
Face value principal – issue date		—			7,000			4,111			7,750			18,861
Fair value adjustment – issue date		—			2,600			(411	)		(750	)		1,439		$	(1,439	)
Installment repayments – common stock		(1,692	)		(13,044	)		—			—			(14,736	)
Non-installment payments – common stock		(6	)		(464	)		—			—			(470	)
Non-installment payments – cash		—			(138	)		(216	)		(246	)		(600	)
Change in fair value		(2	)		(1,123	)		1,116			2,036			2,027			(2,027	)
Lender Fees:
- November 2019 Senior Secured Convertible Note - Series B;																	(700	)
- April 2020 Senior Convertible Note; and																	(411	)
- August 2020 Senior Secured Convertible Note		—			—			—			—			—			(750	)
Fair Value at December 31, 2020	$	—		$	1,270		$	4,600		$	8,790		$	14,660
Other Income (Expense) - Change in fair value – year ended December 31, 2020																$	(5,327	)
Fair Value - December 31, 2018	$	7,903		$	—		$	—		$	—		$	7,903
Face value principal – issue date		—			7,000			—			—			7,000
Fair value adjustment – issue date		—			(648	)		—			—			(648	)	$	648
Installment repayments – common stock		(6,059	)		—			—			—			(6,059	)
Non-installment payments – common stock		(199	)		—			—			—			(199	)
Non-installment payments – cash		(279	)		(86	)		—			—			(365	)
Change in fair value		334			173			—			—			507			(507	)
Lender Fees: - November 2019 Senior Secured Convertible Note - Series A		—			—			—			—			—			(700	)
Fair Value at December 31, 2019	$	1,700		$	6,439		$	—		$	—		$	8,139
Other Income (Expense) - Change in fair value – year ended December 31, 2019																$	(559	)