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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

The following is a summary of stock option activity for employees of continuing operations and discontinued operations for the year ended December 31, 2021:

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Life (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2020
2018 Plan		124,171		$	363.31
2020 Plan		18,000		$	25.50
		142,171		$	320.54
Forfeited		(33,723	)	$	240.17
Outstanding at December 31, 2021		108,448		$	345.54		5.82	$	—
Exercisable at December 31, 2021		88,324		$	422.83		5.27	$	—
Vested and expected to vest at December 31, 2021		108,448		$	345.54		5.82	$	—

Schedule of Fair Value of Options Using the Black Scholes Option Pricing Model and Assumptions Used

The fair value of the stock options granted during the year ended December 31, 2020 under the 2018 Plan and 2020 Plan was estimated using the Black Scholes option pricing model and the weighted average assumptions set forth below

	2018 Plan			2020 Plan
Risk-free interest rate		1.30	%		0.50	%
Volatility		58.96	%		58.33	%
Expected dividend yield		0.00	%		0.00	%
Expected life (in years)		5.8			6.3

Schedule of Restricted Stock Units Activity

The following is a summary of the restricted stock unit activity for the 2018 Plan for employees of continuing operations and discontinued operations for the year ended December 31, 2021:

	Restricted Stock Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2020		33,548		$	21.93
Granted		61,259		$	2.74
Vested		(6,974	)	$	45.12
Forfeited		(17,808	)	$	13.59
Outstanding at December 31, 2021		70,025		$	4.37

Schedule of Restricted Stock Awards Activity

A summary of the restricted stock award activity for employees of continuing operations and discontinued operations for the year ended December 31, 2021 is presented below:

	Restricted Stock Awards			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2020
2018 Plan		286,161		$	4.77
2020 Plan		4,375		$	25.50
		290,536		$	5.08
Granted		103,939		$	4.82
Vested		(88,781	)	$	5.93
Cancelled		(74,998	)	$	4.81
Forfeited		(51,362	)	$	4.81
Outstanding at December 31, 2021		179,334		$	4.71

Schedule of Stock-based Compensation Expense Recorded in Operating Expenses

Stock-based compensation expense recorded in operating expenses was as follows (in thousands):

	Year Ended December 31,
	2021		2020
Selling, general and administrative	$	1,750	$	3,235
Research and development		304		447
Stock-based compensation expense	$	2,054	$	3,682

Schedule of Unrecognized Estimated Stock Based Compensation Expense by Award Type

Total unrecognized estimated stock-based compensation expense by award type and the remaining weighted average recognition period over which such expense is expected to be recognized at December 31, 2021 was as follows:

	Unrecognized Expense (in thousands)		Remaining Weighted Average Recognition Period (in years)
Stock options	$	313		1.7
Restricted stock awards	$	622		2.2
Restricted stock units	$	252		2.1