Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Euroscan Holding B.V. [Member]	Series A Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member] Euroscan Holding B.V. [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Euroscan Holding B.V. [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]
Beginning balances at Dec. 31, 2013	$ 192,948		$ 1,019	$ 48		$ 255,358		$ 235	$ (63,416)	$ (96)	$ (200)
Beginning balances, shares at Dec. 31, 2013			102,054	48,216,480						29,990
Vesting of restricted stock units, shares				289,538
Stock-based compensation	3,519					3,519
Proceeds received from issuance of common stock in connection with public offerings, net of underwriters’ discounts and commissions and offering costs	114,738			$ 21		114,717
Proceeds received from issuance of common stock in connection with public offerings, net of underwriters’ discounts and commissions and offering costs, shares				21,110,714
Common stock issued as form of payment for MPUs	213					213
Common stock issued as payment for MPUs, shares				33,594
Payment of contingent consideration		$ 2,243			$ 1		$ 2,242
Payment of contingent consideration, shares					291,230
Conversion of Series A convertible preferred stock to common stock			$ (147)			147
Conversion of Series A convertible preferred stock to common stock, shares			(14,850)	24,740
Exercise of SARs, shares				109,733
Exercise of stock options	101					101
Exercise of stock options, shares				33,459
Series A convertible preferred stock dividend			$ 37						(37)
Series A convertible preferred stock dividend, shares			3,769
Net loss	(4,525)								(4,684)		159
Foreign currency translation adjustments	(728)							(818)			90
Ending balances at Dec. 31, 2014	308,509		$ 909	$ 70		376,297		(583)	(68,137)	$ (96)	49
Ending balances, shares at Dec. 31, 2014			90,973	70,109,488						29,990
Vesting of restricted stock units, shares				227,382
Stock-based compensation	4,172					4,172
Common stock issued as form of payment for MPUs	358					358
Common stock issued as payment for MPUs, shares				54,801
Conversion of Series A convertible preferred stock to common stock	1		$ (588)	$ 1		588
Conversion of Series A convertible preferred stock to common stock, shares			(58,879)	97,935
Exercise of SARs, shares				74,036
Exercise of stock options	244					244
Exercise of stock options, shares				50,000
Series A convertible preferred stock dividend			$ 36						(36)
Series A convertible preferred stock dividend, shares			3,665
Net loss	(12,999)								(13,251)		252
Foreign currency translation adjustments	(529)							(591)			62
Ending balances at Dec. 31, 2015	299,756		$ 357	$ 71		381,659		(1,174)	(81,424)	$ (96)	363
Ending balances, shares at Dec. 31, 2015			35,759	70,613,642						29,990
Vesting of restricted stock units, shares				262,474
Stock-based compensation	4,469					4,469
Payment of contingent consideration	352					352
Payment of contingent consideration, shares				35,464
Issuance of common stock under employees stock purchase plan	433					433
Issuance of common stock under employees stock purchase plan, shares				48,208
Conversion of Series A convertible preferred stock to common stock			$ (7)			7
Conversion of Series A convertible preferred stock to common stock, shares			(708)	1,178
Exercise of SARs, shares				150,897
Series A convertible preferred stock dividend			$ 14						(14)
Series A convertible preferred stock dividend, shares			1,415
Net loss	(23,226)								(23,511)		285
Foreign currency translation adjustments	84							85			(1)
Ending balances at Dec. 31, 2016	$ 281,868		$ 364	$ 71		$ 386,920		$ (1,089)	$ (104,949)	$ (96)	$ 647
Ending balances, shares at Dec. 31, 2016			36,466	71,111,863						29,990