CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Allowance for Doubtful Accounts Receivable, Current	$ 650,000	$ 597,000
Finite-Lived Intangible Assets, Accumulated Amortization	$ 66,431,000	$ 67,863,000
Preferred stock, par value (USD per share)	$ 0.001	$ 0.001
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock, authorized	250,000,000	250,000,000
Common stock, issued	38,231,000	38,227,000
Common stock, outstanding	38,231,000	38,227,000
Preferred stock, Series A
Preferred stock, authorized	200,000	200,000
Preferred stock, Undesignated series
Preferred stock, authorized	51,700,000	59,800,000
Series B Preferred Stock
Preferred stock, shares issued	8,065,000	0
Preferred stock, shares outstanding	8,065,000	0
Preferred stock, authorized	8,100,000	0