Consolidated Statements of Stockholders' Equity - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2016		26,095,431
Beginning balance at Dec. 31, 2016	$ 414,408	$ 261	$ 417,624	$ (3,477)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock (in shares)		939
Amortization of share-based compensation	16,615		16,615
Treasury stock, net	(38)		(1,058)	1,020
Net loss	(76,413)				(76,413)
Ending balance (in shares) at Sep. 30, 2017		26,096,370
Ending balance at Sep. 30, 2017	$ 354,572	$ 261	$ 433,181	$ (2,457)	$ (76,413)