Employee Benefit Plans (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended			20 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	May 31, 2012
Compensation and Retirement Disclosure [Abstract]
Employer matching contributions	$ 0.2	$ 0.2	$ 0.4
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Common stock, shares authorized	25,000,000	25,000,000		25,000,000
Employee Stock Purchase Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Common stock, shares authorized					100,000
Percentage of fair market value of per share price of common stock	95.00%
Number of offering periods under ESPP	2
Offering period under ESPP	6 months
Number of shares issued under ESPP				2,333