Shareholders' Equity - Summary of Stock Option Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Options
Options outstanding, Beginning Balance (in shares)	267,997	232,869	261,667
Options, granted (in shares)	48,444	46,075	13,678
Options exercised (in shares)	0	(1,250)	(15,601)
Options, Forfeited or expired (in shares)	(153,776)	(9,697)	(26,875)
Options outstanding, Ending Balance (in shares)	162,665	267,997	232,869
Options, Vested or expected to vest (in shares)	102,020
Weighted Average Exercise Price
Weighted Average Exercise Price, Outstanding, Beginning Balance (in USD per share)	$ 47.20	$ 53.20	$ 54.80
Weighted Average Exercise Price, Granted (in USD per share)	11.61	21.60	51.20
Weighted Average Exercise Price, Exercised (in USD per share)	0.00	10.80	94.40
Weighted Average Exercise Price, Forfeited or expired (in USD per share)	40.63	70.40	43.20
Weighted Average Exercise Price, Outstanding, Ending Balance (in USD per share)	43.11	$ 47.20	$ 53.20
Weighted Average Exercise Price, Vested or expected to vest (in USD per share)
Weighted Average Contractual Term and Aggregate Intrinsic Value
Weighted Average Contractual Term, Outstanding	6 years 3 months 20 days
Weighted Average Contractual Term, Vested or expected to vest
Aggregate Intrinsic Value, Outstanding	$ 0
Aggregate Intrinsic Value, Vested or expected to vest