Stockholders' Equity, Series C 6% Super Dividend Redeemable Convertible Preferred Stock (Details) - USD ($)						1 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Jul. 31, 2011	Dec. 30, 2010	Dec. 29, 2010	Jan. 31, 2011	Dec. 31, 2021	Dec. 31, 2020	May 23, 2019	Dec. 31, 2018	Dec. 31, 2017
Redeemable Convertible Preferred Stock [Abstract]
Warrants issued (in shares)							10,857,964
Exercise price of warrant (in dollars per share)									$ 7.00
Common stock shares outstanding (in shares)							59,341,305	57,077,055
Minimum closing price of common stock (in dollars per share)							$ 2.07
Common Stock [Member]
Redeemable Convertible Preferred Stock [Abstract]
Preferred stock issued (in shares)							845,214	14,452
Series C 6% Super Dividend Redeemable Convertible Preferred Stock [Member]
Redeemable Convertible Preferred Stock [Abstract]
Preferred stock issued (in shares)				212		13
Preferred stock par value (in dollars per share)					$ 0.01
Shares issued, price (in dollars per share)				$ 10,000		$ 10,000
Stated value of dividend payment (in dollars per share)				$ 10,000
Gross proceeds from issuance of preferred stock				$ 2,120,000		$ 130,000
Transaction costs				47,000
Net proceeds from issuance of preferred stock				$ 2,073,000
Warrants issued (in shares)				500
Exercise price of warrant (in dollars per share)				$ 7.20
Common stock share conversion price (in dollars per share)				$ 6.00
Common stock shares issued (in shares)				1,667
Preferred stock shares upon conversion (in shares)	33,756	40,193	8,334	293,340
Number of consecutive trading days				15 days			10 days
Preferred stock, dividend rate				6.00%
Preferred stock redemption price (in dollars per share)				$ 3.00			$ 3.00
Post conversion dividend rights (in shares)	20	24	5
Post conversion redemption right, return on investment multiplier amount							$ 10,000
Closing days after conversion rights							30 days
Series C 6% Super Dividend Redeemable Convertible Preferred Stock [Member] | Maximum [Member]
Redeemable Convertible Preferred Stock [Abstract]
Preferred stock issued (in shares)					1,000
Stated value of dividend payment (in dollars per share)					$ 10,000
Convertible preferred stock dividend				$ 100,000
Series C 6% Super Dividend Redeemable Convertible Preferred Stock [Member] | Common Stock [Member]
Redeemable Convertible Preferred Stock [Abstract]
Common stock shares outstanding (in shares)										176	176
Minimum closing price of common stock (in dollars per share)				$ 18.00
Series C 6% Super Dividend Redeemable Convertible Preferred Stock [Member] | Dividend Payment Scenario One [Member]
Redeemable Convertible Preferred Stock [Abstract]
Dividend as percentage of net sales				2.50%
Series C 6% Super Dividend Redeemable Convertible Preferred Stock [Member] | Dividend Payment Scenario Two [Member]
Redeemable Convertible Preferred Stock [Abstract]
Dividend as percentage of net sales				1.25%