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Stockholders' Equity (Summary of Stock Option Activity) (Details) - Stock Options [Member] - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options granted		0
$1.16 – 16.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Balances, December 31, 2019	22,697,000
Number of shares, Balances, March 31, 2020	21,685,000	22,697,000
Exercise price, lower range	$ 1.16	$ 1.16
Exercise price, upper range	16.00	16.00
Weighted average exercise price, Balances, December 31, 2019	5.57
Weighted average exercise price, Balances, March 31, 2020	$ 5.48	$ 5.57
$2.45 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options granted	35,000
Exercise price	$ 2.45
Weighted average exercise price, Options granted	$ 2.45
$1.16 – 4.25 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options exercised	(67,000)
Exercise price, lower range	$ 1.16
Exercise price, upper range	4.25
Weighted average exercise price, Options exercised	$ 3.00
$2.54 – 15.77 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of shares, Options canceled	(980,000)
Exercise price, lower range	$ 2.54
Exercise price, upper range	15.77
Weighted average exercise price, Options canceled	$ 7.80

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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