Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Options Activity

The following is a summary of stock option activity for the year ended December 31, 2022:

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Life (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2021		2,094		$	17,138
Canceled/forfeited		(1,104	)	$	22,279
Outstanding at December 31, 2022		990		$	11,405		4.14	$	—
Vested and expected to vest at December 31, 2022		990		$	11,405		4.14	$	—
Exercisable at December 31, 2022		849		$	13,077		3.92	$	—

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, 2022:

	Restricted Stock Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2021		1,402		$	258.48
Vested		(117	)	$	892.00
Canceled/forfeited		(1,224	)	$	188.35
Outstanding at December 31, 2022		61		$	450.46

Schedule of Restricted Stock Awards Activity

A summary of the restricted stock award activity for the year ended December 31, 2022 is presented below:

	Restricted Stock Awards			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2021		3,586		$	235.03
Vested		(1,660	)	$	241.38
Canceled/forfeited		(978	)	$	211.24
Outstanding at December 31, 2022		948		$	248.48

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,
	2022		2021
Selling, general and administrative	$	387	$	1,750
Research and development		60		304
Stock-based compensation in operating expenses	$	447	$	2,054

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, 2022 was as follows:

	December 31, 2022
	Unrecognized Expense (in thousands)		Remaining Weighted Average Recognition Period (in years)
Stock options	$	93		1.2
Restricted stock awards	$	186		1.0
Restricted stock units	$	14		1.0