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Stockholders' Equity And Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity And Stock-Based Compensation [Abstract]

Warrants Outstanding


						Number of Shares Outstanding under Warrant
						December 31,
Issuance Date		Expiration Date		Exercise Price Per Share		2020		2019

August 17, 2018		February 17, 2021		1.25		554,019		4,496,116
August 17, 2018		February 17, 2021		1.59		—		7,975
						554,019		4,504,091




Stock Option Activity


			Number of Options			Weighted Average Exercise Price		Weighted Average Remaining Contractual Term		Aggregate Intrinsic Value
								In years		In millions
	Outstanding as of December 31, 2019		3,210,965		$	12.27		6.05		$	4.2
	Options granted		60,000			7.25
	Options exercised		(71,105)			3.60
	Options forfeited/canceled		(382,356)			20.31
	Outstanding as of December 31, 2020		2,817,504			11.30		5.60		$	6.4
	Vested and expected to vest at December 31, 2020		2,817,504			11.30		5.60		$	6.4
	Exercisable at December 31, 2020		2,167,633		$	13.86		4.85		$	3.7




Information About Stock Options Outstanding


							Options outstanding							Options exercisable
									Weighted
									average		Weighted					Weighted
							Number of		remaining		average			Number of		average
	Range of exercise prices						outstanding		contractual		exercise			vested		exercise
	From			To			options		life (in years)		price			options		price
	$	0.95		$	1.88		659,688		8.4		$	1.47		251,613		$	1.31
	$	3.24		$	4.09		812,094		6.7		$	3.51		643,377		$	3.48
	$	4.10		$	13.09		598,462		5.0		$	10.89		525,383		$	11.42
	$	14.21		$	35.00		619,599		2.8		$	24.02		619,599		$	24.02
	$	36.40		$	53.55		127,661		0.7		$	51.72		127,661		$	51.72
							2,817,504		5.6		$	11.30		2,167,633		$	13.86



Weighted Average Fair Value Of Options Granted


		2020		2019
	Volatility	123% to 139%		118% to 119%
	Risk-free interest rates	0.46% to 0.78%		1.7% to 2.5%
	Expected life of option	7 years		7 years
	Dividend yield	zero		zero
	Forfeiture rate	zero		zero
	Weighted average fair value of stock options granted	$6.69		$1.60




Summary Of Performance Award Activity


		Number of Performance Awards
Outstanding as of December 31, 2019		138,055
Granted		—
Vested performance awards		—
Forfeited/Canceled		—
Outstanding as of December 31, 2020		138,055




Non-Cash Stock-Based Compensation Expenses



		Year ended
		December 31,
		2020			2019
Research and development		$	453		$	542

General and administrative			535			754

Total non-cash stock-based compensation expense		$	988		$	1,296




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