Common Stock - Reconciliation of Changes in Common Shares Issued and Additional Disclosures (Details)		6 Months Ended
	Nov. 09, 2009 series $ / shares shares	Jun. 30, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Stockholders' Equity, Number of Shares, Par Value and Other Disclosures [Abstract]
Common stock, shares authorized (in shares)	80,000,000	80,000,000	80,000,000
Common stock, par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001	$ 0.0001
Preferred stock, shares authorized (in shares)	100,000	100,000	100,000
Preferred stock, minimum number of series authorized (series) | series	1
Preferred stock, at par value (in dollars per share) | $ / shares	$ 0.0001	$ 0.0001	$ 0.0001
Reconciliation of changes in common shares issued
Shares issued at December 31, 2018		62,162,875
Issued as restricted stock award grants		792,997
Shares issued at June 30, 2019		62,955,872