Summary of Significant Accounting Policies (Details)	Feb. 01, 2016 $ / shares shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 $ / shares shares	Feb. 17, 2016 $ / shares shares
Restated Certificate of Incorporation
Preferred stock, shares authorized (in shares) | shares		10,000,000	10,000,000	10,000,000
Preferred stock, par value (in dollars per share) | $ / shares		$ 0.0001	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares) | shares		100,000,000	27,700,000	100,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001	$ 0.0001	$ 0.0001
Class B-1 Preferred Stock
Restated Certificate of Incorporation
Preferred stock, shares authorized (in shares) | shares	3,278,938
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001
Stock split ratio	1.38
Class B-2 Preferred Stock
Restated Certificate of Incorporation
Preferred stock, shares authorized (in shares) | shares	326,557
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001
Stock split ratio	1.38
Class C Preferred Stock
Restated Certificate of Incorporation
Preferred stock, shares authorized (in shares) | shares	2,365,020
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001
Stock split ratio	1.38
Class D Preferred Stock
Restated Certificate of Incorporation
Preferred stock, shares authorized (in shares) | shares	3,105,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001
Stock split ratio	1.38
Undesignated Preferred Stock
Restated Certificate of Incorporation
Preferred stock, shares authorized (in shares) | shares	1,000,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.0001
Common Stock
Restated Certificate of Incorporation
Common stock, shares authorized (in shares) | shares	30,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001
Stock split ratio	1.38
Preferred Stock | Class B-1 Preferred Stock
Restated Certificate of Incorporation
Stock split ratio	1.38
Preferred Stock | Class B-2 Preferred Stock
Restated Certificate of Incorporation
Stock split ratio	1.38
Preferred Stock | Class C Preferred Stock
Restated Certificate of Incorporation
Stock split ratio	1.38
Preferred Stock | Class D Preferred Stock
Restated Certificate of Incorporation
Stock split ratio	1.38