STATEMENTS OF STOCKHOLDERS' DEFICIT - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital Common Stock	Accumulated Deficit	Series 1 Preferred Stock - Mezzanine
Beginning Balance at Dec. 31, 2016	$ (77,298)	$ 132	$ 580,567	$ (657,997)	$ 125,321
Beginning Balance (in shares) at Dec. 31, 2016		132,376,670			106,184
Exercise of employee stock options	$ 99	$ 1	98
Exercise of employee stock options (in shares)	80,000	26,047
Stock-based compensation	$ 4,082		4,082
Restricted stock buy-back at vesting to cover taxes	(1,042)	$ (1)	(1,041)
Restricted stock buy-back at vesting to cover taxes (in shares)		(148,666)
Issuance of common stock net of commissions and expenses of $2.7 million	47,270	$ 10	47,260
Issuance of common stock net of commissions and expenses of $2.7 million (in shares)		9,708,738
Preferred stock dividends	(9,036)		(9,036)		$ 8,913
Preferred stock dividends (in shares)					6,529
Net loss	(28,349)			(28,349)
Ending Balance at Jun. 30, 2017	$ (64,274)	$ 142	622,052	(686,468)	$ 134,234
Ending Balance (in shares) at Jun. 30, 2017		141,962,789			112,713
Cumulative effect adjustment (Note 3)			$ 122	$ (122)