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Net Loss Per Share | 12 Months Ended
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Dec. 31, 2013
Earnings Per Share [Abstract] |
Net Loss Per Share | 9. Net Loss Per Share Net Loss Per Share Basic and diluted net loss per share attributable to common stockholders was calculated as follows for the years ended December 31, 2011, 2012 and 2013:
|  | Year Ended December 31, |
|  | 2011 |  |  | 2012 |  |  | 2013 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  | $ | (13,157 | ) |  | $ | (13,880 | ) |  | $ | (14,027 | )
Accretion of redeemable convertible preferred stock to redemption value |  |  | (53 | ) |  |  | (67 | ) |  |  | (213 | )
Net loss attributable to common stockholders |  | $ | (13,210 | ) |  | $ | (13,947 | ) |  | $ | (14,240 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding, basic and diluted |  |  | 688,946 |  |  |  | 709,678 |  |  |  | 729,001 |
Net loss per share attributable to common stockholders, basic and diluted |  | $ | (19.17 | ) |  | $ | (19.65 | ) |  | $ | (19.53 | )
The Company excluded the following common stock equivalents, outstanding as of December 31, 2011, 2012 and 2013, from the computation of diluted net loss per share attributable to common stockholders for the years ended December 31, 2011, 2012 and 2013 because they had an anti-dilutive impact due to the net loss attributable to common stockholders incurred for the periods.
|  | December 31, |
|  | 2011 |  |  | 2012 |  |  | 2013 |
Stock options to purchase common stock |  |  | 916,094 |  |  |  | 591,427 |  |  |  | 1,310,330 |
Unvested restricted common stock |  |  | 24,548 |  |  |  | 10,615 |  |  |  | — |
|  |  | 940,642 |  |  |  | 602,042 |  |  |  | 1,310,330 |

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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 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: 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 3: 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 4: 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=32703322&loc=d3e4984-109258 Reference 5: 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=26872669&loc=d3e20235-122688 + Details
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