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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Schedule of shares of common stock for the potential exercise of stock options and stock issuance of shares upon vesting of restricted stock units | We have reserved the following shares of common stock for the potential exercise of stock options and issuance of shares upon vesting of restricted stock units (in thousands):
| December 31, 2017 |  | December 31, 2016
Outstanding stock options | 5,746 |  |  | 4,611 |
Outstanding restricted stock units | — |  |  | 50 |

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- Definition Tabular disclosure of shares of common stock reserved for future issuance. + References No definition available. + Details
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- References No definition available. + Details
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