Condensed Consolidated Statement of Stockholders' (Deficit) Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]	Series A Preferred Stock [Member]
Beginning Balance at Dec. 31, 2015	$ 31,696	$ 53	$ 274,891	$ (47)	$ (243,203)	$ 2
Beginning Balance, shares at Dec. 31, 2015		52,730,799				2,093,155
Stock-based compensation	11,600		11,600
Exercise of stock options	$ 297		297
Exercise of stock options, shares	147,425	147,425
Vesting of restricted stock awards	$ 0	$ 0	0	0	0	$ 0
Vesting of restricted stock awards, shares		592,066
Common stock issuance upon retirement	2,460	$ 1	2,459
Common stock issuance upon retirement, shares		663,221
Equity financing costs	40		40
Net loss	(51,196)				(51,196)
Ending Balance at Sep. 30, 2016	$ (5,103)	$ 54	$ 289,287	$ (47)	$ (294,399)	$ 2
Ending Balance, shares at Sep. 30, 2016		54,133,511				2,093,155