Stockholders' Equity (Deficit) - Common Stock (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Vote $ / shares shares	Dec. 31, 2014 $ / shares shares
Stockholders' Equity (Deficit)
Common stock shares authorized | shares	100,000,000	77,000,000
Common stock par value (in dollars per share) | $ / shares	$ 0.00001	$ 0.00001
Number of votes per share | Vote	1
Dividends declared | $	$ 0