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Computation of Net Income Loss Per Share Basic and Diluted (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Numerator: |  |  |  |
Net income (loss) from continuing operations | $ 598 | $ (490) | $ 360 | $ (767)
Dividends paid to participating securities |  | (123) |  | (262)
Class A |  |  |  |
Numerator: |  |  |  |
Net income (loss) from continuing operations | 133 | (172) | 87 | (292)
Net income (loss) from continuing operations applicable to common stockholders | 133 | (172) | 87 | (292)
Discontinued operations, net of tax | 196 | (15) | 207 | (27)
Net income (loss) applicable to common stockholders, basic | 329 | (187) | 294 | (319)
Net income (loss) from continuing operations | 129 | (172) | 87 | (292)
Net income (loss) from continuing operations applicable to common stockholders | 129 | (172) | 87 | (292)
Diluted discontinued operations, net of tax | 191 | (15) | 204 | (27)
Diluted discontinued operations, net of tax | 191 | (15) | 204 | (27)
Net income (loss) applicable to common stockholders | 320 | (187) | 291 | (319)
Denominator: |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income (loss) per share | 8,377 | 9,570 | 9,168 | 9,576
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share | 8,377 | 9,570 | 9,168 | 9,576
Basic net income (loss) per share: |  |  |  |
Net income (loss) from continuing operations applicable to common stockholders | $ 0.02 | $ (0.02) | $ 0.01 | $ (0.03)
Discontinued operations, net of tax | $ 0.02 | $ 0.00 | $ 0.02 | $ 0.00
Basic net income (loss) per share applicable to common stockholders | $ 0.04 | $ (0.02) | $ 0.03 | $ (0.03)
Diluted net income (loss) per share: |  |  |  |
Net income (loss) from continuing operations applicable to common stockholders | $ 0.02 | $ (0.02) | $ 0.01 | $ (0.03)
Discontinued operations, net of tax | $ 0.02 | $ 0.00 | $ 0.02 | $ 0.00
Diluted net income (loss) per share applicable to common stockholders | $ 0.04 | $ (0.02) | $ 0.03 | $ (0.03)
Class B |  |  |  |
Numerator: |  |  |  |
Net income (loss) from continuing operations | 465 | (318) | 273 | (475)
Dividends paid to participating securities |  | (123) |  | (262)
Net income (loss) from continuing operations applicable to common stockholders | 465 | (441) | 273 | (737)
Discontinued operations, net of tax | 687 | (38) | 645 | (68)
Net income (loss) applicable to common stockholders, basic | 1,152 | (479) | 918 | (805)
Net income (loss) from continuing operations | 469 | (318) | 273 | (475)
Reallocation of diluted discontinued operations for Class A shares as a result of conversion of Class A to Class B shares | 129 | (172) | 87 | (292)
Net income (loss) from continuing operations applicable to common stockholders | 598 | (613) | 360 | (1,029)
Diluted discontinued operations, net of tax | 692 | (38) | 648 | (68)
Diluted discontinued operations, net of tax | 883 | (53) | 852 | (95)
Net income (loss) applicable to common stockholders | 1,481 | (666) | 1,212 | (1,124)
Denominator: |  |  |  |
Weighted average number of shares outstanding used to calculate basic net income (loss) per share | 27,308 | 24,536 | 26,280 | 24,303
Weighted average stock options and warrants and common shares subject to repurchase or cancellation | 1,592 |  | 923 |
Conversion of Class A to Class B common shares outstanding | 8,377 | 9,570 | 9,168 | 9,576
Weighted average number of shares outstanding used to calculate diluted net income (loss) per share | 37,277 | 34,106 | 36,371 | 33,879
Basic net income (loss) per share: |  |  |  |
Net income (loss) from continuing operations applicable to common stockholders | $ 0.02 | $ (0.02) | $ 0.01 | $ (0.03)
Discontinued operations, net of tax | $ 0.02 | $ 0.00 | $ 0.02 | $ 0.00
Basic net income (loss) per share applicable to common stockholders | $ 0.04 | $ (0.02) | $ 0.03 | $ (0.03)
Diluted net income (loss) per share: |  |  |  |
Net income (loss) from continuing operations applicable to common stockholders | $ 0.02 | $ (0.02) | $ 0.01 | $ (0.03)
Discontinued operations, net of tax | $ 0.02 | $ 0.00 | $ 0.02 | $ 0.00
Diluted net income (loss) per share applicable to common stockholders | $ 0.04 | $ (0.02) | $ 0.03 | $ (0.03)
Class B | Discontinued Operations |  |  |  |
Numerator: |  |  |  |
Reallocation of diluted discontinued operations for Class A shares as a result of conversion of Class A to Class B shares | $ 191 | $ (15) | $ 204 | $ (27)

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- Definition Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613673-111683 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.13) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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