Organization and Description of the Business (Details) - USD ($)		1 Months Ended	12 Months Ended
	Mar. 16, 2015	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Retained earnings (accumulated deficit)			$ (362,522,000)	$ (362,006,000)
Proceeds from issuance of private placement, net of offering costs			$ 12,384,000
Private Placement [Member]
Proceeds from issuance of private placement, gross	$ 13,000,000	$ 13,000,000
Proceeds from issuance of private placement, net of offering costs		$ 12,400,000