Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Class A Voting Common Stock	Common Stock Class A Voting Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated other comprehensive loss
Beginning balance, after reverse stock splits at Dec. 31, 2014	$ 207,702		$ 142,638	$ 7,685	$ 58,151	$ (772)
Beginning balance, after reverse stock splits (in shares) at Dec. 31, 2014			7,521,788
Stock-based compensation	2,585			2,585
Foreign currency translation	12					12
Net loss	(27,333)				(27,333)
Ending balance at Dec. 31, 2015	182,966		$ 142,638	10,270	30,818	(760)
Ending balance (in shares) at Dec. 31, 2015		7,521,788	7,521,788
Sale of common stock, net of offering costs	71,817		$ 14	71,803
Sale of common stock, net of offering costs (in shares)			13,800,000
Shares issued for asset acquisition	5,499			5,499
Shares issued for asset acquisition (in shares)			500,227
Stock-based compensation	448			448
Foreign currency translation				(760)		$ 760
Net loss	(94,335)				(94,335)
Ending balance at Dec. 31, 2016	$ 166,395		$ 142,652	$ 87,260	$ (63,517)
Ending balance (in shares) at Dec. 31, 2016		21,822,015	21,822,015