Stockholders' Equity - Capital Structure (Details) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	450,000,000	450,000,000
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, shares outstanding (in shares)	61,543,634	59,210,496
Common stock, shares issued (in shares)	61,543,634	59,210,496
Preferred stock, shares authorized (in shares)	5,000,000	5,000,000
Preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0