Consolidated Statements of Stockholders' Deficit - USD ($) $ in Thousands	Shares Issued to Lenders [Member] Common Stock [Member]	Shares Issued to Lenders [Member] Additional Paid-in Capital [Member]	Shares Issued to Lenders [Member] Retained Earnings [Member]	Shares Issued to Lenders [Member]	Shares Issued Pursuant to Shelf Takedown [Member] Common Stock [Member]	Shares Issued Pursuant to Shelf Takedown [Member] Additional Paid-in Capital [Member]	Shares Issued Pursuant to Shelf Takedown [Member] Retained Earnings [Member]	Shares Issued Pursuant to Shelf Takedown [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Dec. 31, 2014									17,681,274
Balance at Dec. 31, 2014									$ 177	$ 319,604	$ (359,519)	$ (39,738)
Issuance of shares pursuant to bond conversion (in shares)									126,633
Issuance of shares pursuant to bond conversion									$ 1	1,005		1,006
Conversion features										5,139		5,139
Stock compensation expense (in shares)									68,109
Stock compensation expense									$ 1	1,107		1,108
Net Loss											(24,013)	(24,013)
Balance (in shares) at Dec. 31, 2015									17,876,016
Balance at Dec. 31, 2015									$ 179	326,855	(383,532)	(56,498)
Issuance of shares pursuant to bond conversion (in shares)									1,406,723
Issuance of shares pursuant to bond conversion									$ 14	9,566		9,580
Conversion features										1,482		1,482
Stock compensation expense (in shares)									207,868
Stock compensation expense									$ 2	860		862
Net Loss											(26,339)	(26,339)
Issuance of stock (in shares)	1,128,257				1,150,000
Issuance of stock	$ 11	$ 6,075		$ 6,086	$ 12	$ 10,498		$ 10,510
Balance (in shares) at Dec. 31, 2016									21,768,864
Balance at Dec. 31, 2016									$ 218	355,336	(409,871)	$ (54,317)
Issuance of shares pursuant to bond conversion (in shares)									413,335			413,335
Issuance of shares pursuant to bond conversion									$ 4	2,821		$ 2,825
Stock compensation expense (in shares)									511,433
Stock compensation expense									$ 5	2,918		2,923
Net Loss											(33,864)	(33,864)
Issuance of stock (in shares)				29,706					293,802
Issuance of stock									$ 3	3,731		3,734
Balance (in shares) at Dec. 31, 2017									22,987,434
Balance at Dec. 31, 2017									$ 230	$ 364,806	$ (443,735)	$ (78,699)