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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Estimated Weighted Average Grant Date Fair Value per Share | The Company granted options for 469,600 and 487,700 shares of common stock in the years ended December 31, 2017 and 2016, respectively. The fair values of employee stock options granted in the years ended December 31, 2017 and 2016 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, |
|  | 2017 |  |  | 2016 |
Expected term |  | 5.8 years |  |  | 5.7 years |
Expected volatility |  |  | 73 | % |  |  | 72 | %
Risk-free interest rate |  |  | 1.99 | % |  |  | 1.29 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Weighted-average grant date fair value per share |  | $ | 1.60 |  |  | $ | 2.01 |
Summary of Stock Option Activities | A summary of ARCA’s stock option activities for the years ended December 31, 2017 and 2016, and related information as of December 31, 2017, 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, 2015 |  |  | 161,278 |  |  | $ | 18.30 |  |  |  |  |  |  |  |  |
Granted |  |  | 487,700 |  |  |  | 3.22 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited and cancelled |  |  | (19,349 | ) |  |  | 28.70 |  |  |  |  |  |  |  |  |
Options outstanding - December 31, 2016 |  |  | 629,629 |  |  | $ | 6.30 |  |  |  | 8.86 |  |  | $ | 25 |
Granted |  |  | 469,600 |  |  |  | 2.54 |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited and cancelled |  |  | (487,254 | ) |  |  | 3.05 |  |  |  |  |  |  |  |  |
Options outstanding - December 31, 2017 |  |  | 611,975 |  |  | $ | 6.00 |  |  |  | 8.14 |  |  | $ | — |
Options exercisable - December 31, 2017 |  |  | 348,961 |  |  | $ | 8.27 |  |  |  | 7.59 |  |  | $ | — |
Options vested and expected to vest - December 31, 2017 |  |  | 611,101 |  |  | $ | 6.00 |  |  |  | 8.14 |  |  | $ | — |
Summary of RSU Activity | A summary of RSU activity for the years ended December 31, 2017 and 2016 is presented below:
|  | Restricted Stock Units Outstanding |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
RSUs outstanding - December 31, 2015 |  |  | 62,359 |  |  | $ | 8.36 |
Granted |  |  | — |  |  |  | — |
Vested and released |  |  | (31,149 | ) |  |  | 8.85 |
Forfeited and cancelled |  |  | (471 | ) |  |  | 4.69 |
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 |
Summary of Non-cash, Share-based Compensation Expense | For the years ended December 31, 2017 and 2016, the Company recognized the following non-cash, share-based compensation expense (in thousands):
| Years Ended |
| December 31, |
| 2017 |  |  | 2016 |
Research and development | $ | 169 |  |  | $ | 167 |
General and administrative |  | 289 |  |  |  | 409 |
Total | $ | 458 |  |  | $ | 576 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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