Subsequent Event (Details) - ATM Agreement - USD ($)		2 Months Ended	12 Months Ended
	Dec. 20, 2016	Feb. 25, 2017	Dec. 31, 2016
Subsequent Events
Common stock issued (in shares)			0
Commission rate (as a percent)	2.00%
Equity issue costs	$ 103,000
Subsequent Event
Subsequent Events
Common stock issued (in shares)		640,000
Sale price (in dollars per shares)		$ 0.74
Gross proceeds from common stock sale		$ 475,000
Commission rate (as a percent)		2.00%
Commission payment		$ 10,000
Equity issue costs		$ 2,000