Stock Incentive Plans (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Aug. 31, 2007	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017
Stock Incentive Plans (Textual)
Stock compensation expense		$ 7,000	$ 17,000
Unrecognized compensation cost		$ 59,000
Stock-based plan expect to recognize weighted-average period		1 year 6 months
Stock compensation expense related to restricted stock		$ 4,000	$ 57,000
Common stock reserved for future issuance of awards		326,786
Plan termination date		Mar. 17, 2026
Stock option intrinsic value		$ 50,280
Stock options exercisable or outstanding		$ 34,000
Stock options forfeited rate percentage		28.99%
Number of restricted stock units granted		6,592
Restricted stock units, description		The Company did not record any RSU expense for the three months ended March 31, 2019. For the three months ended March 31, 2018, the Company recorded $90,000 of RSU expense.
Outstanding non-vested restricted stock		2,454
Closing price, description		At the time the negotiation of the terms of the employment agreement began, the closing price of the common stock was $5.50. On the date of grant, the closing price of the common stock was $6.30.
Restricted Stock Units (RSUs) [Member]
Stock Incentive Plans (Textual)
Unrecognized compensation cost		$ 7,000
Restricted Stock Units (RSUs) [Member] | Key Executive [Member]
Stock Incentive Plans (Textual)
Number of restricted stock units granted				30,902	59,098
Grant date fair value of restricted stock units				$ 209,000	$ 323,000
2007 Plan [Member]
Stock Incentive Plans (Textual)
Maximum number of shares awarded or sold	440,769
Plan termination date	Jun. 24, 2016