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Net Income (Loss) Per Share - Reconciliation used in Computing Basic and Diluted Net Income (Loss) per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2009
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | $ 4,123 us-gaap_IncomeLossFromContinuingOperations | $ 40,155 us-gaap_IncomeLossFromContinuingOperations | $ (7,350)us-gaap_IncomeLossFromContinuingOperations |
Gain from discontinued operations, net of tax |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 153 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax | 187 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Net income (loss) used in computing basic and diluted net income (loss) per share | $ 1,017 us-gaap_NetIncomeLoss | $ 1,073 us-gaap_NetIncomeLoss | $ 169 us-gaap_NetIncomeLoss | $ 1,864 us-gaap_NetIncomeLoss | $ 37,403 us-gaap_NetIncomeLoss | $ 599 us-gaap_NetIncomeLoss | $ 466 us-gaap_NetIncomeLoss | $ 1,687 us-gaap_NetIncomeLoss | $ 4,123 us-gaap_NetIncomeLoss | $ 40,155 us-gaap_NetIncomeLoss | $ (7,197)us-gaap_NetIncomeLoss |
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Shares used in computation of basic and diluted net income (loss) per share (weighted average common shares outstanding) | 27,733 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,505 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,383 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,370 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,614 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,558 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,146 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,424 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,246 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 28,190 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 27,735 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Dilutive potential common shares: |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock and RSUs |  |  |  |  |  |  |  |  | 261 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 343 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 0 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Stock options |  |  |  |  |  |  |  |  | 637 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 805 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | 0 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |
Shares used in computation of diluted net income (loss) per share | 28,430 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,351 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,210 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,382 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,675 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,653 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,293 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 28,294 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,144 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 29,338 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 27,735 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Basic net income (loss) per share from: |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  |  |  |  |  |  |  |  | $ 0.15 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ 1.42 us-gaap_IncomeLossFromContinuingOperationsPerBasicShare | $ (0.27)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare |
Discontinued operations |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare |
Total | $ 0.04 us-gaap_EarningsPerShareBasic | $ 0.04 us-gaap_EarningsPerShareBasic | $ 0.01 us-gaap_EarningsPerShareBasic | $ 0.07 us-gaap_EarningsPerShareBasic | $ 1.31 us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic | $ 0.02 us-gaap_EarningsPerShareBasic | $ 0.06 us-gaap_EarningsPerShareBasic | $ 0.15 us-gaap_EarningsPerShareBasic | $ 1.42 us-gaap_EarningsPerShareBasic | $ (0.26)us-gaap_EarningsPerShareBasic |
Diluted net income (loss) per share from: |  |  |  |  |  |  |  |  |  |  |  |
Continuing operations |  |  |  |  |  |  |  |  | $ 0.14 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ 1.37 us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare | $ (0.27)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare |
Discontinued operations |  |  |  |  |  |  |  |  | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.00 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare | $ 0.01 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare |
Total | $ 0.04 us-gaap_EarningsPerShareDiluted | $ 0.04 us-gaap_EarningsPerShareDiluted | $ 0.01 us-gaap_EarningsPerShareDiluted | $ 0.06 us-gaap_EarningsPerShareDiluted | $ 1.26 us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 0.02 us-gaap_EarningsPerShareDiluted | $ 0.06 us-gaap_EarningsPerShareDiluted | $ 0.14 us-gaap_EarningsPerShareDiluted | $ 1.37 us-gaap_EarningsPerShareDiluted | $ (0.26)us-gaap_EarningsPerShareDiluted |

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + 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 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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