Stock Incentive Plans (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding, Ending balance	125,564
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant, Beginning balance	243,218	73,227
Shares available for grant, Authorized		190,000
Shares available for grant, Granted	(85,071)	(153,769)
Shares available for grant, Exercised/issued
Shares available for grant, Canceled/forfeited	116,347	133,760
Shares available for grant, Ending balance	274,494	243,218
Number of options outstanding, Beginning balance	253,541	285,157
Number of options outstanding, Granted		94,362
Number of options outstanding, Exercised/issued	(938)
Number of options outstanding, Canceled/forfeited	(127,039)	(125,978)
Number of options outstanding, Ending balance	125,564	253,541
Weighted-average option exercise price, Beginning balance	$ 37.31	$ 70.67
Weighted-average option exercise price, Granted		6.34
Weighted-average option exercise price, Exercised/issued	6.10
Weighted-average option exercise price, Canceled/forfeited	51.85	89.63
Weighted-average option exercise price, Ending balance	$ 19.53	$ 37.31
Number of restricted stock shares issued, Beginning balance	76,483	20,146
Number of restricted stock shares issued, Granted	21,209	59,407
Number of restricted stock shares issued, Exercised/issued
Number of restricted stock shares issued, Canceled/forfeited		(3,070)
Number of restricted stock shares issued, Ending balance	97,692	76,483
Number of restricted stock units outstanding, Beginning balance	12,584	45,402
Number of restricted stock units outstanding, Granted	63,862
Number of restricted stock units outstanding, Exercised/issued	(53,625)	(13,368)
Number of restricted stock units outstanding, Canceled/forfeited	(437)	(19,450)
Number of restricted stock units outstanding, Ending balance	22,384	12,584