Stockholders' Equity - Shares Issued for Legal Settlement (Details) - Marketing Sponsorship Partner
$ in Millions
1 Months Ended
Nov. 30, 2013
USD ($)
marketing_sponsorship
shares
Class of Stock [Line Items]  
Number of marketing sponsorship partners | marketing_sponsorship 1
Cash payments $ 0.3
Shares of common stock issued | shares 36,666
Total expense $ 0.6