Capitalization - Capital Stock Authorized and Par Value (Details) - $ / shares	Dec. 31, 2016	Feb. 17, 2016	Feb. 01, 2016	Dec. 31, 2015
Common stock
Common stock, shares authorized (in shares)	100,000,000			22,080,000
Common stock, par value (in dollars per share)	$ 0.0001			$ 0.0001
Common stock, shares issued (in shares)	27,700,054			6,817,093
Common stock, shares outstanding (in shares)	27,700,054			6,817,093
Undesignated Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)		10,000,000	1,000,000
Preferred stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Class B-1 Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)			3,278,938	3,278,938
Preferred stock, par value (in dollars per share)	$ 0.0001		$ 0.0001	$ 0.0001
Preferred stock, shares issued (in shares)	0			3,237,528
Preferred stock, shares outstanding (in shares)	0			3,237,528
Class B-2 Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)			326,557
Preferred stock, par value (in dollars per share)			$ 0.0001
Class C Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)			2,365,020	2,365,020
Preferred stock, par value (in dollars per share)	$ 0.0001		$ 0.0001	$ 0.0001
Preferred stock, shares issued (in shares)	0			2,365,020
Preferred stock, shares outstanding (in shares)	0			2,365,020
Class D Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)			3,105,000	3,105,000
Preferred stock, par value (in dollars per share)	$ 0.0001		$ 0.0001	$ 0.0001
Preferred stock, shares issued (in shares)	0			3,093,092
Preferred stock, shares outstanding (in shares)	0			3,093,092
Common Stock
Common stock
Common stock, shares authorized (in shares)	100,000,000	100,000,000	30,000,000	22,080,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Common stock, shares issued (in shares)	27,700,054
Common stock, shares outstanding (in shares)	27,700,054
Preferred Stock | Undesignated Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)	10,000,000			1,000,000
Preferred stock, par value (in dollars per share)	$ 0.0001			$ 0.0001
Preferred stock, shares issued (in shares)	0
Preferred stock, shares outstanding (in shares)	0
Preferred Stock | Class B-1 Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)				3,278,938
Preferred stock, par value (in dollars per share)				$ 0.0001
Preferred Stock | Class B-2 Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)				326,557
Preferred stock, par value (in dollars per share)				$ 0.0001
Preferred Stock | Class C Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)				2,365,020
Preferred stock, par value (in dollars per share)				$ 0.0001
Preferred Stock | Class D Preferred Stock
Preferred stock
Preferred stock, shares authorized (in shares)				3,105,000
Preferred stock, par value (in dollars per share)				$ 0.0001