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Stockholders' Equity (Notes) | 9 Months Ended
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Sep. 30, 2018
Stockholders' Equity Attributable to Parent [Abstract] |
Stockholders' Equity | 9. Stockholders' Equity There were 139,241 and 305,348 shares issued upon the vesting of restricted stock units, exercise of stock options and purchases of stock under the Employee Stock Purchase Plan for the three and nine months ended September 30, 2018, respectively. The accumulated other comprehensive loss balance at September 30, 2018 and December 31, 2017, and other comprehensive income during the nine months ended September 30, 2018, consists of foreign currency translation adjustments.

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- Definition The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2208821 + Details
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