Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total	Common Stock [Member]		Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2013		$ 105,023	$ 49	[1]		$ 203,238	$ (98,264)
Balance, Shares at Dec. 31, 2013	[1]		48,842
Stock-based compensation		1,840				1,840
Issuance of common stock, net of issuance costs		52,433	$ 14	[1]		52,419
Issuance of common stock, net of issuance costs, Shares	[1]		14,110
Exercise of stock options and restricted stock units		75				75
Exercise of stock options and restricted stock units, Shares	[1]		221
Exercise of warrants		16				16
Exercise of warrants, Shares	[1]		10
Issuance of warrants		54				54
Net loss		(37,652)					(37,652)
Balance at Dec. 31, 2014		121,789	$ 63	[1]		257,642	(135,916)
Balance, Shares at Dec. 31, 2014	[1]		63,183
Stock-based compensation		3,311				3,311
Issuance of common stock, net of issuance costs		58,331	$ 21	[1]		58,310
Issuance of common stock, net of issuance costs, Shares	[1]		20,756
Issuance of common stock, acquisition		43,677	$ 15	[1]		43,662
Issuance of common stock, acquisition, Shares	[1]		15,543
Exercise of stock options and restricted stock units		259	$ 1	[1]		258
Exercise of stock options and restricted stock units, Shares	[1]		698
Return of common stock to pay withholding taxes on restricted stock		(73)			$ (73)
Return of common stock to pay withholding taxes on restricted stock, Shares					(31)
Issuance of warrants		97				97
Other comprehensive loss		(3,166)						$ (3,166)
Net loss		(46,948)					(46,948)
Balance at Dec. 31, 2015		177,277	$ 100	[1]	$ (73)	363,280	(182,864)	(3,166)
Balance, Shares at Dec. 31, 2015			100,180	[1]	(31)
Stock-based compensation		5,033				5,033
Issuance of common stock, net of issuance costs		58,029	$ 15	[1]		58,014
Issuance of common stock, net of issuance costs, Shares	[1]		15,086
Exercise of stock options and restricted stock units		166				166
Exercise of stock options and restricted stock units, Shares	[1]		419
Return of common stock to pay withholding taxes on restricted stock		(168)			$ (168)
Return of common stock to pay withholding taxes on restricted stock, Shares					(63)
Issuance of common stock for services		116				116
Issuance of common stock for services, Shares	[1]		96
Other comprehensive loss		(2,603)						(2,603)
Net loss		(119,980)					(119,980)
Balance at Dec. 31, 2016		$ 117,870	$ 115	[1]	$ (241)	$ 426,609	$ (302,844)	$ (5,769)
Balance, Shares at Dec. 31, 2016			115,781	[1]	(94)

[1] Adjusted for 1:5 reverse stock split on March 31, 2014.