Stock Incentive Plans (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options outstanding, Ending balance	69,083
Stock incentive and equity plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant, Beginning balance	274,494	243,218
Shares available for grant, Granted	(47,953)	(85,071)
Shares available for grant, Exercised/issued
Shares available for grant, Canceled/forfeited	68,526	116,347
Shares available for grant, Ending balance	295,067	274,494
Number of options outstanding, Beginning balance	125,564	253,541
Number of options outstanding, Granted	10,000
Number of options outstanding, Exercised/issued	(938)	(938)
Number of options outstanding, Canceled/forfeited	(65,543)	(127,039)
Number of options outstanding, Ending balance	69,083	125,564
Weighted-average option exercise price, Beginning balance	$ 19.53	$ 37.31
Weighted-average option exercise price, Granted
Weighted-average option exercise price, Exercised/issued	6.10	6.10
Weighted-average option exercise price, Canceled/forfeited	31.66	51.85
Weighted-average option exercise price, Ending balance	$ 12.10	$ 19.53
Number of restricted stock shares issued, Beginning balance	97,692	76,483
Number of restricted stock shares issued, Granted	1,878	21,209
Number of restricted stock shares issued, Exercised/issued
Number of restricted stock shares issued, Canceled/forfeited
Number of restricted stock shares issued, Ending balance	99,570	97,692
Number of restricted stock units outstanding, Beginning balance	22,384	12,584
Number of restricted stock units outstanding, Granted	36,075	63,862
Number of restricted stock units outstanding, Exercised/issued	(5,300)	(53,625)
Number of restricted stock units outstanding, Canceled/forfeited	(2,983)	(437)
Number of restricted stock units outstanding, Ending balance	50,176	22,384