Stockholders' Equity - Summary of Stock Option Activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Number of shares outstanding	16,665,000
Number of shares granted	187,000
Number of shares exercised	(70,000)
Number of shares expired and forfeited	(272,000)
Number of shares outstanding	16,510,000	16,665,000
Number of shares outstanding, weighted average exercise price	$ 20.47
Number of shares granted, weighted average exercise price	20.11
Number of shares exercised, weighted average exercise price	7.20
Number of shares expired and forfeited, weighted average exercise price	22.26
Number of shares outstanding, weighted average exercise price	$ 20.49	$ 20.47
Number of shares outstanding, weighted average remaining contractual term (Year)	7 years 6 months 3 days	7 years 10 months 13 days