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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock Options

	Stock Options			Weighted Average Exercise Price		Weighted Average Remaining Life (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding at December 31, 2021		108,448		$	345.54
Canceled/forfeited		(6,871	)	$	90.76
Outstanding at June 30, 2022		101,577		$	362.77		3.83	$	—
Exercisable at June 30, 2022		88,451		$	412.48		3.27	$	—
Vested and expected to vest at June 30, 2022		101,577		$	362.77		3.83	$	—

Schedule of Restricted Stock Units Activity

Restricted Stock Units

	Restricted Stock Units			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2021		70,025		$	4.37
Vested		(5,864	)	$	12.17
Canceled/forfeited		(57,343	)	$	3.04
Outstanding at June 30, 2022		6,818		$	8.88

Schedule of Restricted Stock Awards Activity

Restricted Stock Awards

	Restricted Stock Awards			Weighted Average Grant Date Fair Value
Outstanding at December 31, 2021		179,334		$	4.71
Vested		(63,284	)	$	4.78
Canceled/forfeited		(36,062	)	$	4.31
Outstanding at June 30, 2022		79,988

Schedule of Stock-based Compensation Expense Included in Operating Expenses

The following table summarizes stock-based compensation expense for the Plans included in operating expenses for the periods presented (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Selling, general and administrative	$	104	$	530	$	217	$	1,473
Research and development		19		95		68		224
Stock-based compensation in operating expenses	$	123	$	625	$	285	$	1,697

Schedule of Unrecognized Estimated Stock Based Compensation Expense by Award Type

Unrecognized stock-based compensation expense by award type and the remaining weighted average recognition period over which such expense is expected to be recognized as of June 30, 2022 was as follows:

	Unrecognized Expense (in thousands)		Remaining Weighted Average Recognition Period (in years)
Stock options	$	190		1.5
Restricted stock awards	$	321		1.7
Restricted stock units	$	50		1.4