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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement [Abstract] |  |  |
Revenues | $ 185,279 | $ 206,980 | $ 204,724
Cost of revenues | 63,742 | 61,834 | 78,669
Amortization of acquired intangible assets | 1,453 | 1,736 | 1,733
Gross profit | 120,084 | 143,410 | 124,322
Operating expenses: |  |  |
Research and development | 17,767 | 16,799 | 14,190
In-process research and development | 274 | 527 | 0
Sales and marketing | 70,856 | 77,179 | 76,960
General and administrative | 34,867 | 43,381 | 47,949
Amortization of acquired intangible assets | 2,400 | 2,974 | 3,009
Goodwill and intangible assets impairment | 165,171 | 0 | 0
Restructuring expenses | 1,188 | 706 | 9,665
Litigation settlement expenses | 0 | 0 | 45,982
Total operating expenses | 292,523 | 141,566 | 197,755
Operating (loss) income | (172,439) | 1,844 | (73,433)
Other income (expense): |  |  |
Interest income | 53 | 10 | 6
Interest expense | (12,589) | (13,616) | (3,959)
Other income (expense), net | 6,980 | (33) | (1,662)
Total other income (expense) | (5,556) | (13,639) | (5,615)
Loss before income taxes | (177,995) | (11,795) | (79,048)
Income tax provision | 681 | 1,087 | 3,179
Net loss | $ (178,676) | $ (12,882) | $ (82,227)
Net loss per common share: |  |  |
Net loss per basic share (in dollars per share) | $ (1.79) | $ (0.13) | $ (0.85)
Net loss per diluted share (in dollars per share) | $ (1.79) | $ (0.16) | $ (0.85)
Weighted-average shares used in computing net loss per share: |  |  |
Shares used in calculating basic net loss per share (in shares) | 99,574 | 97,347 | 96,235
Shares used in calculating diluted net loss per share (in shares) | 99,574 | 97,735 | 96,235

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