Common Stock - Narrative (Details) - $ / shares	1 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Oct. 31, 2018
Class of Stock [Line Items]
Common stock authorized (in shares)	19,333,333	100,000,000	19,333,333	100,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock authorized (in shares)		5,000,000		5,000,000
Preferred stock, par value (in dollars per share)		$ 0.0001		$ 0.0001
Preferred stock issued (in shares)		0
Preferred stock outstanding (in shares)		0
Common stock, dividends declared (in dollars per share)		$ 0	$ 0
Series 1 Common Stock
Class of Stock [Line Items]
Common stock authorized (in shares)	6,000,000
Series 2 Common Stock
Class of Stock [Line Items]
Increase in common stock authorized (in shares)	555,555
Common stock authorized (in shares)	13,333,333