Condensed Consolidated Statement of Stockholders' Equity - 6 months ended Jun. 30, 2018 - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Non-controlling Interests	Total
Balance at Dec. 31, 2017	$ 4	$ 230,679	$ (131,967)	$ (898)	$ 1,212	$ 99,030
Balance (in shares) at Dec. 31, 2017	40,995					40,995
Issuance of common stock under stock incentive plans		8,455				$ 8,455
Issuance of common stock under stock incentive plans (in shares)	1,258
Shares withheld for taxes		(7,586)				(7,586)
Stock-based compensation expense		6,464				6,464
Non-controlling interest distributions					(614)	(614)
Cumulative effect of a change in accounting principle | ASC 606			3,257		69	3,326
Net loss			(1,114)		851	(263)
Other comprehensive loss (income)				(325)	54	(271)
Balance at Jun. 30, 2018	$ 4	$ 238,012	$ (129,824)	$ (1,223)	$ 1,572	$ 108,541
Balance (in shares) at Jun. 30, 2018	42,253					42,253