Equity Offering - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands				12 Months Ended
	Feb. 02, 2016	Feb. 02, 2016	Feb. 01, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Equity Offering [Line Items]
Proceeds from sale of common stock, net of issuance costs				$ 0	$ 37,230	$ 0
Subsequent Event
Equity Offering [Line Items]
Proceeds from sale of common stock, net of issuance costs	$ 6,200
Subsequent Event | Underwritten public offering
Equity Offering [Line Items]
Number of shares issued in transaction		5,000,000
Share price (in dollars per share)	$ 1.00	$ 1.00
Subsequent Event | 30-day option granted to underwriters to purchase additional stock
Equity Offering [Line Items]
Number of shares issued in transaction		750,000
Subsequent Event | Private placement
Equity Offering [Line Items]
Number of shares issued in transaction			1,700,000
Share price (in dollars per share)			$ 1.00