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Share-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Estimated Weighted Average Grant Date Fair Value per Share | The Company granted options and awards for 420,279 and 1,160,535 shares of common stock in the years ended December 31, 2014 and 2013, respectively. The fair values of the majority of employee stock options granted in the years ended December 31, 2014 and 2013 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, |
|  | 2014 |  |  | 2013 |
Expected term |  | 5.9 years |  |  | 5.8 years |
Expected volatility |  |  | 94 | % |  |  | 96 | %
Risk-free interest rate |  |  | 1.53 | % |  |  | 1.62 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
Weighted-average grant date fair value per share |  | $ | 1.37 |  |  | $ | 1.05 |
Summary of Stock Option and Stock Award Activities | A summary of ARCA’s stock option and stock award activities for the years ended December 31, 2014 and 2013, and related information as of December 31, 2014, is as follows:
|  | Years Ended December 31, |
|  | 2014 |  |  | 2013 |
|  | Number of Options |  |  | Weighted Average Exercise Price |  |  | Number of Options |  |  | Weighted Average Exercise Price |
Options outstanding, beginning of period |  |  | 843,442 |  |  | $ | 3.76 |  |  |  | 144,019 |  |  | $ | 18.28 |
Granted |  |  | 228,579 |  |  |  | 1.81 |  |  |  | 741,535 |  |  |  | 1.38 |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Forfeited and cancelled |  |  | (3,506 | ) |  |  | 140.67 |  |  |  | (42,112 | ) |  |  | 11.62 |
Options outstanding, end of period |  |  | 1,068,515 |  |  | $ | 2.89 |  |  |  | 843,442 |  |  | $ | 3.76 |
Options exercisable, end of period |  |  | 494,291 |  |  | $ | 4.38 |  |  |  | 194,550 |  |  | $ | 11.14 |
Options vested and expected to vest |  |  | 1,066,712 |  |  | $ | 2.89 |  |  |  |  |  |  |  |  |
Summary of Stock Options Outstanding and Exercisable | The following table summarizes information about stock options outstanding and exercisable as of December 31, 2014:
|  |  |  |  |  |  |  |  |  | Options Outstanding |  |  | Options Exercisable |
Range of Exercise Prices |  |  | Number Outstanding |  |  | Weighted Average Remaining Contractual Term (in years) |  |  | Weighted Average Exercise Price |  |  | Number Exercisable |  |  | Weighted Average Exercise Price |
$ | 0.36 |  |  | — |  | $ | 1.33 |  |  |  | 29,933 |  |  |  | 9.75 |  |  | $ | 1.05 |  |  |  | 704 |  |  | $ | 1.08 |
| 1.38 |  |  | — |  |  | 1.38 |  |  |  | 727,869 |  |  |  | 8.47 |  |  |  | 1.38 |  |  |  | 329,189 |  |  |  | 1.38 |
| 1.40 |  |  | — |  |  | 1.95 |  |  |  | 212,495 |  |  |  | 9.11 |  |  |  | 1.89 |  |  |  | 70,410 |  |  |  | 1.84 |
| 1.96 |  |  | — |  |  | 22.98 |  |  |  | 82,300 |  |  |  | 4.44 |  |  |  | 13.68 |  |  |  | 78,070 |  |  |  | 13.55 |
| 22.99 |  |  | — |  |  | 33.42 |  |  |  | 15,918 |  |  |  | 3.74 |  |  |  | 32.87 |  |  |  | 15,918 |  |  |  | 32.87 |
|  |  |  |  |  |  |  |  |  |  | 1,068,515 |  |  |  | 8.25 |  |  | $ | 2.89 |  |  |  | 494,291 |  |  | $ | 4.38 |
Summary of RSU activity | A summary of RSU activity for the years ended December 31, 2014 and 2013 is presented below:
|  | Years Ended December 31, |
|  | 2014 |  |  | 2013 |
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |  |  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Restricted stock units outstanding, beginning of period |  |  | 419,000 |  |  | $ | 1.39 |  |  |  | — |  |  | $ | — |
Granted |  |  | 191,700 |  |  |  | 1.95 |  |  |  | 419,000 |  |  |  | 1.39 |
Vested and released |  |  | (139,671 | ) |  |  | 1.39 |  |  |  | — |  |  |  | — |
Forfeited and cancelled |  | — |  |  | — |  |  | — |  |  | — |
Restricted stock units outstanding, end of period |  |  | 471,029 |  |  | $ | 1.62 |  |  |  | 419,000 |  |  | $ | 1.39 |
Non-Cash, Share-Based Compensation Expense | For the years ended December 31, 2014 and 2013, the Company recognized the following non-cash, share-based compensation expense (in thousands):
| December 31, |
| 2014 |  |  | 2013 |
Research and development | $ | 158 |  |  | $ | 77 |
General and administrative | $ | 489 |  |  | $ | 206 |
Total | $ | 647 |  |  | $ | 283 |

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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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 4: 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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