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Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Estimated Weighted Average Grant Date Fair Value per Share

The Company granted no options to purchase shares of common stock in the year ended December 31, 2019 and options to purchase an aggregate of 2,220 shares of common stock in the year ended December 31, 2018, respectively. The fair values of employee stock options granted in the year ended December 31, 2018 were estimated at the date of grant using the Black-Scholes model with the following assumptions and had the following estimated weighted average grant date fair value per share:

		Year Ended December 31,
		2018
Expected term		5.3 years
Expected volatility			90	%
Risk-free interest rate			2.59	%
Expected dividend yield			0	%
Weighted-average grant date fair value per share		$	9.34

Summary of Stock Option Activities

A summary of ARCA’s stock option activities for the years ended December 31, 2019 and 2018, and related information as of December 31, 2019, is as follows:

		Options Outstanding
		Number of Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (in years)				Aggregate Intrinsic Value (in thousands)
Options outstanding - December 31, 2017			33,938			$	107.37
Granted			2,220				12.96
Exercised			—				—
Forfeited and cancelled			(2,655	)			169.17
Options outstanding - December 31, 2018			33,503			$	96.22				7.29			$	—
Granted			—				—
Exercised			—				—
Forfeited and cancelled			(2,367	)			250.36
Options outstanding - December 31, 2019			31,136			$	84.50				6.26			$	—
Options exercisable - December 31, 2019			30,074			$	86.42				6.24			$	—
Options vested and expected to vest -        December 31, 2019			31,136			$	84.50				6.26			$	—

Summary of RSU Activity

There was no RSU activity for the year ended December 31, 2019. A summary of RSU activity for the year ended December 31, 2018 is presented below:

		Restricted Stock Units Outstanding
		Number of Shares				Weighted Average Grant Date Fair Value
RSUs outstanding - December 31, 2017			842			$	142.92
Granted			—				—
Vested and released			(842	)			142.92
Forfeited and cancelled			—				—
RSUs outstanding - December 31, 2018			—			$	—

Summary of Non-cash, Share-based Compensation Expense

For the years ended December 31, 2019 and 2018, the Company recognized the following non-cash, share-based compensation expense (in thousands):

	Years Ended
	December 31,
	2019				2018
Research and development	$	71			$	117
General and administrative		80				156
Total	$	151			$	273

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year.

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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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