STATEMENTS OF CHANGES IN PREFERRED STOCK AND STOCKHOLDERS' Equity (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid In Capital Common Stock	Accumulated Deficit	Series 1 Preferred Stock - Mezzanine
Balance at Dec. 31, 2017	$ (96,806)	$ 143	$ 615,493	$ (712,442)	$ 143,992
Balance (in shares) at Dec. 31, 2017		142,658,037			119,644
Adjustment for implementation of ASU No. 2014-09, Revenue from Contracts with Customers	(8,131)			(8,131)
Stock-based compensation	3,659		3,659
Cancelled restricted common stock (in shares)		(70,867)
Repurchase of restricted common stock	(731)	$ (1)	(730)
Repurchase of restricted common stock (Shares)		(188,234)
Preferred stock dividends					$ 5,047
Preferred stock dividends	(5,120)		(5,120)
Preferred stock dividends (in shares)					3,624
Net loss	(16,020)			(16,020)
Balance at Mar. 31, 2018	(123,149)	$ 142	613,302	(736,593)	$ 149,039
Balance (in shares) at Mar. 31, 2018		142,398,936			123,268
Balance at Dec. 31, 2018	85,564	$ 161	651,732	(566,329)
Balance (in shares) at Dec. 31, 2018		161,066,136
Stock-based compensation	1,456		1,456
Issuance of restricted common stock	1,000	$ 1	999
Issuance of restricted common stock (in shares)		1,393,536
Cancelled restricted common stock (in shares)		(7,333)
Repurchase of restricted common stock	(370)		(370)
Repurchase of restricted common stock (Shares)		(165,178)
Net loss	(13,434)			(13,434)
Balance at Mar. 31, 2019	$ 74,216	$ 162	$ 653,817	$ (579,763)
Balance (in shares) at Mar. 31, 2019		162,287,161