The following table provides a reconciliation of Non-GAAP net income and Non-GAAP diluted income per share to net (loss) income and (loss) income per share – diluted, the most comparable GAAP financial measures:
| (Unaudited) | ||||||||||||||||
| Three Months Ended June 30, | Six Months Ended June 30, | |||||||||||||||
| (in thousands, except per share amounts) | 2019 | 2018 | 2019 | 2018 | ||||||||||||
| Net (loss) income | $ | (3,120 | ) | $ | (1,080 | ) | $ | 9,899 | $ | 23,604 | ||||||
| Stock-based compensation expense | 2,080 | 434 | 3,292 | 650 | ||||||||||||
| Amortization of intangible assets | 3,600 | 1,986 | 7,128 | 3,926 | ||||||||||||
| Acquisition related deferred revenue (1) | 2,250 | — | 4,500 | — | ||||||||||||
| Special adjustments (2) | 776 | 929 | 1,004 | (223 | ) | |||||||||||
| Income tax effect of non-GAAP adjustments | (1,057 | ) | (124 | ) | (1,827 | ) | (199 | ) | ||||||||
| Non-GAAP net income | $ | 4,529 | $ | 2,145 | $ | 23,996 | $ | 27,758 | ||||||||
| (Loss) income per share - diluted | $ | (0.04 | ) | $ | (0.02 | ) | $ | 0.13 | $ | 0.32 | ||||||
| Non-GAAP income per share - diluted | $ | 0.06 | $ | 0.03 | $ | 0.31 | $ | 0.36 | ||||||||
| GAAP diluted shares outstanding: | 71,373 | 65,580 | 77,017 | 72,881 | ||||||||||||
| Non-GAAP diluted shares outstanding: | 77,700 | 77,000 | 77,700 | 77,000 | ||||||||||||
