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Stock Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2020

Stock Incentive Plans

Summary of stock option activity

							Weighted
							Average
				Weighted-			Remaining		Aggregate
				Average Exercise			Contractual		Intrinsic Value
		Shares		Price			Term (years)		(in thousands)
Outstanding at December 31, 2019		785,832		$	16.48		8.13		$	470
Granted		666,200		$	5.69
Exercised		(7,000)		$	4.39
Cancelled or forfeited		(76,884)		$	14.65
Expired		(481)		$	32.10
Outstanding at December 31, 2020		1,367,667		$	11.38		8.13		$	—
Vested and exercisable at December 31, 2020		504,171		$	21.22		6.68		$	—

Schedule of assumptions made based on the Black-Scholes option pricing model

		Year Ended December 31,
		2020				2019
Weighted-average expected volatility		75.51	-	82.08	%	68.9	-	110.5	%
Expected term (in years)		5.50	-	6.25		5.50	-	10.00
Risk-free interest rate		0.37	-	1.51	%	1.39	-	2.69	%
Expected dividend yield				0	%			0	%

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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.

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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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