Stockholders' Equity - Summary of Warrant Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Weighted Average Exercise Price, Beginning balance ($ per share)	$ 6.78	$ 6.78
Weighted Average Exercise Price, Granted ($ per share)	0.00	0.00
Weighted Average Exercise Price, Exercised ($ per share)	6.78
Weighted Average Exercise Price, Ending balance ($ per share)	0.00	$ 6.78
Weighted Average Exercise Price, Exercisable ($ per share)	$ 0.00
Exercise of Issued Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Number of shares, outstanding beginning (shares)	445,000	445,000
Number of shares, granted (shares)	0	0
Number of shares, exercised (shares)	(445,000)
Number of shares, outstanding ending balance (shares)	0	445,000
Number of shares, exercisable (shares)	0