Stockholders' Equity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2014	Jun. 30, 2016	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 (in dollars per share)	$ 4.60
Replacement shelf registration	$ 150,000
Proceeds from future sales of common stock under an agreement with investment bank			$ 50,000
Proceeds from future sales of common stock			$ 110,000
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance, beginning		$ 90,661
Balance, ending		73,838
AOCL [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance, beginning		(26)
Foreign currency translation adjustment		(38)
Balance, ending		(64)
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Balance, beginning		(26)
Foreign currency translation adjustment		(38)
Balance, ending		$ (64)