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Share-based Compensation (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Estimated Weighted Average Grant Date Fair Value per Share

The Company granted options for 40,000 and 469,600 shares of common stock in the years ended December 31, 2018 and 2017, respectively. The fair values of employee stock options granted in the years ended December 31, 2018 and 2017 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:

		Years Ended December 31,
		2018				2017
Expected term		5.3 years				5.8 years
Expected volatility			90	%			73	%
Risk-free interest rate			2.59	%			1.99	%
Expected dividend yield			0	%			0	%
Weighted-average grant date fair value per share		$	0.52			$	1.60

Summary of Stock Option Activities

A summary of ARCA’s stock option activities for the years ended December 31, 2018 and 2017, and related information as of December 31, 2018, 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, 2016			629,629			$	6.30
Granted			469,600				2.54
Exercised			—				—
Forfeited and cancelled			(487,254	)			3.05
Options outstanding - December 31, 2017			611,975			$	6.00				8.14			$	—
Granted			40,000				0.72
Exercised			—				—
Forfeited and cancelled			(47,972	)			9.51
Options outstanding - December 31, 2018			604,003			$	5.37				7.29			$	—
Options exercisable - December 31, 2018			486,420			$	6.04				7.13			$	—
Options vested and expected to vest -        December 31, 2018			603,842			$	5.38				7.29			$	—

Summary of RSU Activity

A summary of RSU activity for the years ended December 31, 2018 and 2017 is presented below:

		Restricted Stock Units Outstanding
		Number of Shares				Weighted Average Grant Date Fair Value
RSUs outstanding - December 31, 2016			30,739			$	7.91
Granted			—				—
Vested and released			(15,171	)			7.94
Forfeited and cancelled			(400	)			6.03
RSUs outstanding - December 31, 2017			15,168			$	7.94
Granted			—				—
Vested and released			(15,168	)			7.94
Forfeited and cancelled			—				—
RSUs outstanding - December 31, 2018			—			$	—

Summary of Non-cash, Share-based Compensation Expense

For the years ended December 31, 2018 and 2017, the Company recognized the following non-cash, share-based compensation expense (in thousands):

	Years Ended
	December 31,
	2018				2017
Research and development	$	117			$	169
General and administrative		156				289
Total	$	273			$	458

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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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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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