2013 | 2012 | 2011 | ||||||||||
Gross research and development expenses | $ | 92,469 | $ | 86,305 | $ | 76,993 | ||||||
Less: Amounts included in cost of revenue | (3,741 | ) | (1,080 | ) | (410 | ) | ||||||
Less: Reimbursed research and development (excludes amounts in revenue) | (1,000 | ) | (20,922 | ) | (27,131 | ) | ||||||
Net research and development expenses | $ | 87,728 | $ | 64,303 | $ | 49,452 |