Stock Purchase (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Unexercised warrants (shares)	45,564	415,871
Additional exercised warrant per purchase agreement (shares)	370,307
Price per warrant (usd per share)	$ 2
Proceeds from warrants	$ 741