Stock-based Compensation - Stock Option and Restricted Share Activity (Details) - USD ($)		9 Months Ended
	Jul. 22, 2016	Sep. 30, 2016	Sep. 30, 2015
Employee and Directors Stock Options [Member]
Stock-based compensation expense
Shares available for future issuance		538,093
Shares
Outstanding at the beginning of the period (in shares)		289,350
Options granted (in shares)		772,410
Options cancelled (in shares)		(151,783)
Outstanding at the end of the period (in shares)		909,977
Exercisable at the end of the period (in shares)		268,567
Weighted average exercise price per share
Outstanding at the beginning of the period (in dollars per share)		$ 159.66
Options granted (in dollars per share)		9.51
Options cancelled (in dollars per share)		207.97
Outstanding at the end of the period (in dollars per share)		18.61
Exercisable at the end of the period (in dollars per share)		$ 37.21
Additional disclosures
Total cash received from stock option exercises		$ 0	$ 0
Weighted-average grant date fair value of options (in dollars per share)		$ 7.50
Employee and Directors Stock Options [Member] | Maximum [Member]
Stock-based compensation expense
Expiration period		10 years
Restricted Stock [Member]
Shares
Outstanding at the beginning of the period (in shares)		12,192
Granted (in shares)	208,255	208,765
Forfeited (in shares)		(49)
Vested (in shares)		(62,574)
Outstanding at the end of the period (in shares)		158,334
Weighted average grant date fair value per share
Outstanding at the beginning of the period (in dollars per share)		$ 91.46
Granted (in dollars per share)		9.46
Forfeited (in dollars per share)		77.00
Vested (in dollars per share)		22.31
Outstanding at the end of the period (in dollars per share)		$ 10.67