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Net Loss Per Share | 12 Months Ended
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Dec. 31, 2012
Earnings (Loss) Per Share [Abstract] |
Earnings (Loss) Per Share | (2) Net Loss Per Share The Company calculates basic earnings per share by dividing (loss) earnings attributable to common stockholders by the weighted average common shares outstanding during the period, excluding common stock subject to vesting provisions. Diluted earnings per share is computed by dividing (loss) attributable to common stockholders by the weighted average number of common shares outstanding during the period increased to include, if dilutive, the number of additional common shares that would have been outstanding if the potential common shares had been issued. The Company’s potentially dilutive shares include options and warrants. A reconciliation of the numerator and denominator used in the calculation of basic and diluted loss per share follows:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |
(In thousands, except shares and per share data) |  |  |  |  |  |
Net loss |  | $ | (4,320 | ) |  | $ | (5,364 | )
Net loss available to common shareholders |  | $ | (4,320 | ) |  | $ | (5,364 | )
Weighted average shares of common stock outstanding |  |  | 2,226,299 |  |  |  | 1,675,824 |
Less: Weighted-average shares of unvested common stock |  |  | (2,783 | ) |  |  | (2,783 | )
Total weighted-average shares used in computing net loss per share attributed to common stockholders |  |  | 2,223,516 |  |  |  | 1,673,041 |
Basic and diluted loss per share |  | $ | (1.94 | ) |  | $ | (3.21 | )
Potentially dilutive securities representing 762,000 and 349,000 weighted average shares of common stock were excluded for the years ended December 31, 2012 and 2011, respectively, because including them would have an anti-dilutive effect on net loss attributable to common stockholders per share. Subsequent to December 31, 2012, the Company sold 521,066 shares of ARCA common stock and warrants to purchase 315,356 shares of ARCA common stock in two separate equity financings (see Note 8). Those shares, and the potentially dilutive securities represented by the warrants, had the transactions occurred before December 31, 2012, would have changed the number of common shares and potential common shares outstanding as of December 31, 2012.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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