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Stock-Based Compensation and Employee Stock Purchase Program (Tables)

12 Months Ended

Dec. 31, 2020

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity Under Stock Incentive Plans

The following is a summary of stock option information and weighted average exercise prices under the Company’s stock incentive plans (in thousands, except share data and price per share):

		Shares Subject to Outstanding Options				Weighted- Average Exercise Price Per Share				Aggregate Intrinsic Value
Outstanding — Balance at December 31, 2018			530,044			$	35.53			$	—
Options granted			208,571				5.13
Options exercised			(546	)			4.63
Options forfeited			(30,132	)			33.95
Options expired			(46,236	)			98.69
Outstanding — Balance at December 31, 2019			661,701				21.60			$	305
Options granted			502,494				4.28
Options exercised			—				—
Options forfeited			(174,508	)			5.91
Options expired			(99,928	)			25.56
Outstanding — Balance at December 31, 2020			889,759				14.46			$	240
Vested and expected to vest — December 31, 2020			841,991				15.03			$	240
Exercisable —December 31, 2020			502,973			$	22.20			$	—

Weighted-Average Fair Value Assumption of Stock Option Awards

The fair value of stock option awards was estimated at the date of grant using a Black-Scholes option-pricing model with the following weighted-average assumption:

		Year Ended December 31,
Assumptions		2020				2019
Expected term (years)			6.48				7.04
Expected volatility		134%				99%
Risk-free interest rate		1.01%				2.01%
Expected dividend yield			—				—

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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