Stockholders' Equity - Celebrity Warrants (Details) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) item shares	Dec. 31, 2014 USD ($)
Warrants and Rights Note Disclosure [Abstract]
Shares vested	2,422
Non-cash warrant (benefit)/expense | $	$ (55)	$ 2,009	$ 1,192
Celebrity Warrants
Warrants and Rights Note Disclosure [Abstract]
Number of other entities | item		1
Number of shares, if warrants exercised		1,100
Celebrity Warrants August 2015
Warrants and Rights Note Disclosure [Abstract]
Number of shares, if warrants exercised		1,000
Percent of shares that vest upon public announcement of license agreement		50.00%
Warrant vesting period		24 months
Celebrity Warrants September 2015
Warrants and Rights Note Disclosure [Abstract]
Number of shares, if warrants exercised		100
Warrant vesting period		60 months
Percent of shares subject to accelerated vesting		25.00%
Common Stock | Celebrity Warrants
Warrants and Rights Note Disclosure [Abstract]
Number of Shares Outstanding Under Warrant	1,600