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General - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Jun. 30, 2016
Class Of Stock [Line Items]
Net loss	$ 11,332,000	$ 1,813,000
Net cash used in operating activities	3,817,000	$ 3,817,000
Accumulated deficit	290,520,000		$ 279,188,000
Senior Secured Convertible Notes [Member]
Class Of Stock [Line Items]
Debt instrument, principal face amount	$ 22,143,000			$ 35,000,000

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