Stock Purchase (Details) $ / shares in Units, $ in Thousands	1 Months Ended		2 Months Ended
	Mar. 31, 2013 USD ($) $ / shares $ / warrant shares	Apr. 30, 2012 USD ($) $ / shares $ / warrant shares	Oct. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2016 shares	Mar. 14, 2014 $ / shares
Securities Financing Transactions Disclosures [Abstract]
Price per share (dollars per share) | $ / shares		$ 1.03			$ 16.80
Stock and warrants purchase price | $		$ 14,400
Shares of common stock (shares)		14,000,000
Warrants to purchase common stock (shares)		7,000,000
Price per warrant (dollars per share) | $ / warrant	1.03	1.03
Additional warrant to purchase common stock (shares)	7,000,000	7,000,000
Price per warrant (dollars per share) | $ / warrant		2.00
Value of warrants | $		$ 5,900
Value of common stock | $		$ 8,500
Exercised warrant per purchase agreement (shares)	7,000,000
Exercised warrants (percent)	92.00%
Price per warrant (dollars per share) | $ / shares	$ 2		$ 2
Additional exercised warrant per purchase agreement (shares)	6,400,000
Unexercised warrants (shares)	571,160			415,871
Proceeds from warrants | $	$ 20,100		$ 311
Additional exercised warrant per purchase agreement (shares)			155,289