CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	As Previously Reported	Common Stock	Common Stock As Previously Reported	Additional Paid-in Capital	Additional Paid-in Capital As Previously Reported	Accumulated Deficit	Accumulated Deficit As Previously Reported	Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss As Previously Reported
Balance at Dec. 31, 2018	$ 18,421		$ 557		$ 116,864		$ (96,350)		$ (2,650)
Balance (in shares) at Dec. 31, 2018			53,774,221
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	1,104				1,104
Issuance of stock for vested restricted stock units	0		$ 1		(1)
Issuance of stock for vested restricted stock units (in shares)			76,206
Cumulative translation adjustment	292								292
Net loss	(25,124)						(25,124)
Balance at Dec. 31, 2019	(5,307)	$ (5,307)	$ 56	$ 558	118,469	$ 117,967	(121,474)	$ (121,474)	(2,358)	$ (2,358)
Balance (in shares) at Dec. 31, 2019			5,385,043	53,850,427
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock based compensation expense	767				767
Issuance of stock for vested restricted stock units (in shares)			4,906
Reclassification of derivative liabilities to equity	8,460				8,460
Warrant issuance	329				329
Fair value of conversion feature on Convertible 2023 Series D Notes	9,885		$ 164		9,721
Fair value of conversion feature on Convertible 2023 Series D Notes (in shares)			16,362,654
APIC related to Series C Convertible Notes	(2,528)				(2,528)
Cumulative translation adjustment	264								264
Net loss	(122,022)						(122,022)
Stock issued as a result of the reverse stock split (in shares)			1,620
Balance at Dec. 31, 2020	$ (110,152)		$ 220		$ 135,218		$ (243,496)		$ (2,094)
Balance (in shares) at Dec. 31, 2020			21,754,223