Stock-Based Payments - Restricted Stock Units Activity (Details)		12 Months Ended
	Dec. 16, 2016	Dec. 31, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares	Dec. 31, 2014 $ / shares shares
Number of RSUs
Stock consolidation ratio	0.20
RSUs
Number of RSUs
Outstanding, Beginning Balance (in shares)		0	12,800
Granted (in shares)		1,036,735
Redeemed (in shares)		0
Cancelled (in shares)		(7,854)
Outstanding, Ending Balance (in shares)		1,028,881	0	12,800
Weighted average grant date fair value restricted stock granted (in dollars per share) | $ / shares		$ 8.82	$ 0	$ 20.4
RSUs | Aegerion
Number of RSUs
Granted (in shares)		140,605
Weighted average grant date fair value restricted stock granted (in dollars per share) | $ / shares		$ 9.53