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Net Income (Loss) Per Share (Tables) | 9 Months Ended
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Sep. 30, 2012
Net Income (Loss) Per Share [Abstract] |
Computation of net income (loss) per share basic and diluted |
|  | Nine months ended September 30, |
|  | 2011 |  |  | 2012 |
|  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 538 |  |  | $ | 1,433 |  |  | $ | (319 | ) |  | $ | (543 | )
Dividends paid to participating securities |  |  | — |  |  |  | (191 | ) |  |  | — |  |  |  | (262 | )
Net income (loss) applicable to common stockholders |  | $ | 538 |  |  | $ | 1,242 |  |  | $ | (319 | ) |  | $ | (805 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income (loss) per share |  |  | 10,027 |  |  |  | 23,136 |  |  |  | 9,576 |  |  |  | 24,303 |
Basic net income (loss) per share applicable to common stockholders |  | $ | 0.05 |  |  | $ | 0.05 |  |  | $ | (0.03 | ) |  | $ | (0.03 | )
|  | Three months ended September 30, |
|  | 2011 |  |  | 2012 |
|  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 349 |  |  | $ | 904 |  |  | $ | (187 | ) |  | $ | (356 | )
Dividends paid to participating securities |  |  | — |  |  |  | (66 | ) |  |  | — |  |  |  | (123 | )
Net income (loss) applicable to common stockholders |  | $ | 349 |  |  | $ | 838 |  |  | $ | (187 | ) |  | $ | (479 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income (loss) per share |  |  | 9,851 |  |  |  | 23,673 |  |  |  | 9,570 |  |  |  | 24,536 |
Basic net income (loss) per share applicable to common stockholders |  | $ | 0.04 |  |  | $ | 0.04 |  |  | $ | (0.02 | ) |  | $ | (0.02 | )
|  | Nine months ended September 30, |
|  | 2011 |  |  | 2012 |
|  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 507 |  |  | $ | 1,464 |  |  | $ | (319 | ) |  | $ | (543 | )
Dividends paid to participating securities |  |  | — |  |  |  | (191 | ) |  |  | — |  |  |  | (262 | )
Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares |  |  | — |  |  |  | 507 |  |  |  | — |  |  |  | (319 | )
Net income (loss) applicable to common stockholders |  | $ | 507 |  |  | $ | 1,780 |  |  | $ | (319 | ) |  | $ | (1,124 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income (loss) per share |  |  | 10,027 |  |  |  | 23,136 |  |  |  | 9,576 |  |  |  | 24,303 |
Weighted average stock options and warrants and common shares subject to repurchase or cancellation |  |  | — |  |  |  | 2,017 |  |  |  | — |  |  |  | — |
Conversion of Class A to Class B common shares outstanding |  |  | — |  |  |  | 10,027 |  |  |  | — |  |  |  | 9,576 |
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share |  |  | 10,027 |  |  |  | 35,180 |  |  |  | 9,576 |  |  |  | 33,879 |
Diluted net income (loss) per share applicable to common stockholders |  | $ | 0.05 |  |  | $ | 0.05 |  |  | $ | (0.03 | ) |  | $ | (0.03 | )
|  | Three months ended September 30, |
|  | 2011 |  |  | 2012 |
|  | Class A |  |  | Class B |  |  | Class A |  |  | Class B |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  | $ | 325 |  |  | $ | 928 |  |  | $ | (187 | ) |  | $ | (356 | )
Dividends paid to participating securities |  |  | — |  |  |  | (66 | ) |  |  | — |  |  |  | (123 | )
Reallocation of net income (loss) for Class A shares as a result of conversion of Class A to Class B shares |  |  |  |  |  |  | 325 |  |  |  |  |  |  |  | (187 | )
Net income (loss) applicable to common stockholders |  | $ | 325 |  |  | $ | 1,187 |  |  | $ | (187 | ) |  | $ | (666 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income (loss) per share |  |  | 9,851 |  |  |  | 23,673 |  |  |  | 9,570 |  |  |  | 24,536 |
Weighted average stock options and warrants and common shares subject to repurchase or cancellation |  |  | — |  |  |  | 2,420 |  |  |  | — |  |  |  | — |
Conversion of Class A to Class B common shares outstanding |  |  | — |  |  |  | 9,851 |  |  |  | — |  |  |  | 9,570 |
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share |  |  | 9,851 |  |  |  | 35,944 |  |  |  | 9,570 |  |  |  | 34,106 |
Diluted net income (loss) per share applicable to common stockholders |  | $ | 0.03 |  |  | $ | 0.03 |  |  | $ | (0.02 | ) |  | $ | (0.02 | )

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations. + References No definition available. + Details
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