Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Preferred Stock, Par or Stated Value Per Share	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	5,000,000	5,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	43,877,000	42,790,000
Common stock, shares outstanding	40,326,000	39,464,000
Treasury stock, shares	3,551,000	3,326,000
Series A Preferred Stock
Preferred Stock, Par or Stated Value Per Share	$ 0.0001
Series B Preferred Stock
Preferred Stock, Par or Stated Value Per Share	$ 0.0001
Preferred stock, shares issued	357,000	357,000
Preferred stock, shares outstanding	357,000	357,000
Series A-1 Preferred Stock [Member]
Preferred Stock, Par or Stated Value Per Share	$ 0.0001
Preferred stock, shares issued	4,210,000	4,210,000
Dividend declared, not yet distributed (in shares)	4,085,000	4,085,000
Preferred stock, shares outstanding	4,210,000	4,210,000