Consolidated Statement of Stockholders Equity - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Total
Increase (decrease) in equity
Adoption of ASU 2016-01 | Accounting Standards Update 2016-01			$ (40)	$ 40
Balance at the beginning of the period at Dec. 31, 2017	$ 11	$ 158,738	(55,617)	$ (40)	$ 103,092
Balance at the beginning of the period (in shares) at Dec. 31, 2017	106,275				106,300
Increase (decrease) in equity
Share-based compensation		10,716			$ 10,716
Restricted stock vesting	123
Net loss			(19,682)		(19,682)
Balance at the end of the period at Jun. 30, 2018	$ 11	$ 169,454	$ (75,339)		$ 94,126
Balance at the end of the period (in shares) at Jun. 30, 2018	106,398				106,400