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Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2021

Share-based Payment Arrangement [Abstract]

Share-based Compensation Expense

The Company recognized share-based compensation in its Condensed Consolidated Statements of Operations and Comprehensive Loss during 2021 and 2020 as follows:

			Three Months Ended June 30,												Six Months Ended June 30,
			2021						2020						2021						2020
Manufacture and supply			$	71					$	72					$	153					$	135
Research and development			208						183						440						365
Selling, general and administrative			1,442						1,510						2,635						3,125
Total share-based compensation expenses			$	1,721					$	1,765					$	3,228					$	3,625
Share-based compensation from:
Restricted stock units			$	43					$	309					$	81					$	773
Stock options			1,667						1,445						3,136						2,841
Employee stock purchase plan			11						11						11						11
Total share-based compensation expenses			$	1,721					$	1,765					$	3,228					$	3,625

Restricted Stock Units Awards

The following tables provide information about the Company’s restricted stock unit and stock option activity during the six-month period ended June 30, 2021:

Restricted Stock Unit Awards (RSUs):			Number of Units						Weighted Average Grant Date Fair Value
			(in thousands)
Unvested as of December 31, 2020			14						$	11.38
Granted			—						—
Vested			(4)						$	7.54
Forfeited			(2)						$	13.00
Unvested as of June 30, 2021			8						$	13.00
Grant date fair value of shares vested during the period			$	30
Unrecognized compensation costs as of June 30, 2021			$	1

Stock Option Activity

Unrecognized compensation costs related to awards of RSUs are expected to be recognized over a weighted-average period of less than one year.

Stock Option Awards:			Number of Options						Weighted Average Exercise Price
			(in thousands)
Outstanding as of December 31, 2020			3,259						$	8.14
Granted			1,211						$	4.73
Exercised, Forfeited, Expired			(39)						$	5.63
Outstanding as of June 30, 2021			4,431						$	7.23
Vested and expected to vest as of June 30, 2021			4,246						$	7.34
Exercisable as of June 30, 2021			1,824						$	9.92

Valuation Assumptions for Determination of Fair Value of Options

The fair values of stock options granted during the six months ended June 30, 2021 were estimated using the Black-Scholes pricing model based on the following assumptions:

Expected dividend yield			—		%
Expected volatility			95% - 100%
Expected term (years)			6.1
Risk-free interest rate			1.0		%

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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