Employee and Consultant Equity-Based Compensation - Summary of ESPP Activity (Details) - 2016 ESPP - Employee Stock $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued (shares) | shares	11,093
Weighted average fair value (dollars per share) | $ / shares	$ 20.40
Employee purchases (in thousands) | $	$ 226