Stockholders' Equity (Details) $ / shares in Units, $ in Thousands		12 Months Ended
	Oct. 13, 2015 shares	Dec. 31, 2016 USD ($) Vote $ / shares shares	Dec. 31, 2015 $ / shares shares	Aug. 28, 2015 shares
Stockholders' Equity
Preferred stock, shares authorized		10,000,000	10,000,000
Preferred stock, shares outstanding		0	0
Convertible preferred stock, shares outstanding				11,677,076
Issuance of stock upon conversion, shares	11,677,076
Common stock shares authorized		100,000,000	100,000,000
Common stock par value (in dollars per share) | $ / shares		$ 0.00001	$ 0.00001
Number of votes per share | Vote		1
Dividends declared | $		$ 0