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Consolidated Statements of Stockholders' Equity (Parentheticals) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Nonemployee |  |  |
Share-based compensation expense, stock option awards | $ 579 | $ 576 | $ 499
Share-based compensation expense, RSU awards | 552 | 370 | 447
Employee |  |  |
Share-based compensation expense, stock option awards | 7,908 | 6,728 | 5,926
Share-based compensation expense, RSU awards | 3,364 | $ 1,606 | $ 163
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition | $ 412 |  |

X
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- Definition Amount of equity-based compensation, related to restricted stock units or restricted stock awards, recognized as expense or an asset, if compensation is capitalized. + References No definition available. + Details
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- Definition This element represents the amount of recognized equity-based compensation related to stock options during the period, that is, the amount recognized as expense in the income statement (or as asset if compensation is capitalized). + References No definition available. + Details
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