Basis of Presentation and Significant Accounting Policies (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended			1 Months Ended		6 Months Ended
	Jun. 25, 2014	Jun. 11, 2014	Apr. 24, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Common Stock	Jun. 11, 2014 Common Stock
Basis of Presentation and Significant Accounting Policies
Common Stock issued under initial public offering (in shares)		6,500,000				7,012,744
Share issue price (in dollars per share)		$ 8.00
Conversion of convertible preferred stock into common stock (in shares)		19,465,132				22,327,786
Number of shares of common stock issued in satisfaction of accumulated dividends accrued on the preferred stock		2,862,654
Initial public offering
Warrants issued for purchase of shares of common stock (in shares)							149,452
Options exercised by underwriters (in shares)	512,744
Aggregate proceeds received, net of underwriting discounts and commissions and offering costs				$ 50.2
Common stock, shares authorized				200,000,000	100,000,000
Reverse stock-split ratio			2.28