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Net income per share attributable to common stockholders | 3 Months Ended
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Mar. 31, 2013
Net income per share attributable to common stockholders |
Net income per share attributable to common stockholders | 11. Net income per share attributable to common stockholders The following table sets forth the computation of basic and diluted net income per share attributable to common stockholders:
|  | Three Months Ended March 31, |
|  | 2013 |  | 2012 |
|  | (in thousands) |
Numerator: |  |  |  |  |
Net (loss) income attributable to common stockholders, basic and diluted |  | $ | (1,121 | ) | $ | 1,657 |
Denominator: |  |  |  |  |
Weighted average common stock, basic |  | 35,597 |  | 33,969 |
Dilutive effect of stock-based awards |  | — |  | 2,663 |
Weighted average common stock, dilutive |  | 35,597 |  | 36,632 |
Net (loss) income per share attributable to common stockholders: |  |  |  |  |
Basic |  | $ | (0.03 | ) | $ | 0.05 |
Diluted |  | $ | (0.03 | ) | $ | 0.05 |
For the three months ended March 31, 2013, we excluded all stock options and RSUs from the computation of diluted net loss per share due to the net loss for the quarter. For the three months ended March 31, 2012, 2,033,129 options to purchase common stock were not included in the computation of diluted net income per share as the inclusion would have been anti-dilutive.

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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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