Annual report pursuant to Section 13 and 15(d)

Stock Based Compensation - Schedule of Equity Compensation Plan by Arrangements (Details)

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Stock Based Compensation - Schedule of Equity Compensation Plan by Arrangements (Details) - 2013 Equity Compensation Plan [Member]
12 Months Ended
Dec. 31, 2017
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards Reserved for Issuance 14,155,000
Awards Issued 12,627,000 [1]
Awards Available for Grant 1,528,000
[1] includes both stock grants and option grants