Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2016	Dec. 31, 2015
Stockholders' Equity [Abstract]
Common stock, authorized (in shares)		160,000	160,000
Common stock, par value (in dollars per share)		$ 0.0013	$ 0.0013
Preferred stock, authorized (in shares)		20,000	20,000
Preferred stock, par value (in dollars per share)		$ 0.001	$ 0.001
Common Stock sold in public offering (in shares)	8,750
Proceeds from public offering of common stock, net of underwriting discounts and commissions and offering expenses	$ 37,500
Common stock offering price	$ 4.60
Replacement shelf registration	$ 150,000
Proceeds from future sales of common stock under an agreement with investment bank		$ 50,000
PGNX_ Proceeds From Future Sales Of Common Stock		110,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Loss		(92)	$ (26)
Foreign Currency Translation Adjustment		$ (66)