Stockholders' Equity - Authorized Capitalization (Details) - $ / shares	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Equity [Abstract]
Common stock, shares authorized	80,000,000		80,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	10,000,000		10,000,000
Preferred stock, par value (in dollars per share)	$ 0.0001		$ 0.0001