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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Statement of Comprehensive Income [Abstract] |  |
Net income (loss) | $ 7,804 | $ (10,402)
Other comprehensive income (loss): |  |
Unrealized gain (loss) on marketable securities, net of tax | 8 | (14)
Total comprehensive income (loss) | $ 7,812 | $ (10,416)

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