Common Stock and Preferred Stock (Details)						1 Months Ended										12 Months Ended
		Jul. 09, 2020 $ / shares shares	Aug. 09, 2019 USD ($) $ / shares shares	Jan. 01, 2019 shares	Jun. 09, 2014 $ / shares	Dec. 31, 2020 USD ($) $ / shares shares	Nov. 30, 2020 USD ($) shares	Oct. 31, 2020 USD ($) shares	Aug. 31, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares	Jan. 31, 2020 USD ($) shares	Aug. 31, 2019 shares	Jan. 31, 2019 USD ($) shares	Jan. 31, 2018 USD ($) shares	Jun. 30, 2014 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares		Dec. 31, 2019 USD ($) $ / shares shares		Dec. 31, 2018 USD ($) shares		Jul. 08, 2020 shares
Common Stock and Preferred Stock (Details) [Line Items]
Stockholders' Equity, Reverse Stock Split		1 for 10
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares		$ 0.001				$ 0.001										$ 0.001		$ 0.001
Common Stock, Shares, Outstanding (in Shares)		4,239,578				5,694,772										5,694,772		3,521,037				42,395,782
Capital Units, Authorized (in Shares)						105,000,000										105,000,000
Common Stock, Shares Authorized (in Shares)						100,000,000										100,000,000		100,000,000
Preferred Stock, Shares Authorized (in Shares)						5,000,000										5,000,000
Common Stock, Shares, Issued (in Shares)						5,694,772										5,694,772		3,521,037
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ / shares					$ 77.10
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in Shares)												16,417
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in Shares)																		16,149		12,529
Stock Issued During Period, Shares, New Issues (in Shares)			585,300
Stock Issued During Period, Value, New Issues | $			$ 4,200,000															$ 4,214,000	[1]
Paid-in-Kind Interest | $																$ 4,366,000		$ 1,725,000		$ 0
Stock Issued During Period, Value, Conversion of Convertible Securities | $	[1]															$ 20,212,000
Temporary Equity, Shares Issued (in Shares)			200,000			200,000										200,000		200,000
Temporary Equity, Par or Stated Value Per Share (in Dollars per share) | $ / shares			$ 0.001			$ 0.001										$ 0.001		$ 0.001
Temporary Equity, Shares Outstanding (in Shares)						200,000										200,000		200,000
Temporary Equity, Initial Value Per Share (in Dollars per share) | $ / shares			$ 100
Temporary Equity, Quarterly Dividend Rate																6.00%
Temporary Equity, Dividends, Adjustment | $																$ 1,257,000		$ 483,000		0
Temporary Equity, Number Of Shares Outstanding In Which One Director May Be Elected (in Shares)			50,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | $						$ 0										$ 0		$ 0		$ 27,974,000
Minimum [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Temporary Equity, Liquidation Preference Percent Of Accreted Amount			20.00%
Maximum [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																4 years
Temporary Equity, Liquidation Preference Percent Of Accreted Amount			150.00%
3.25% Convertible Senior Notes (due 2020) [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Debt Conversion, Converted Instrument, Amount | $						1,000,000.0	$ 4,000,000.0	$ 2,000,000.0	$ 1,000,000.0	$ 7,100,000
Paid-in-Kind Interest | $						$ 36,528	$ 138,248	$ 63,225	$ 27,288	$ 200,000
Common Stock [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Stock Repurchased During Period, Shares (in Shares)															311,284	(17,000)	[1]	(19,000)	[1]	(4,000)	[1]
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share) | $ / shares															$ 77.10
Stock Repurchased During Period, Value | $															$ 24,000,000.0
Stock Issued During Period, Shares, New Issues (in Shares)	[1]																	585,000
Stock Issued During Period, Value, New Issues | $	[1]																	$ 1,000
Stock Issued During Period, Value, Conversion of Convertible Securities | $	[1]															$ 2,000
Common Stock [Member] | 3.25% Convertible Senior Notes (due 2020) [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Debt Conversion, Converted Instrument, Shares Issued (in Shares)						177,085	708,340	354,170	177,085	710,100
Stock Issued During Period, Value, Conversion of Convertible Securities | $						$ 1,400,000	$ 5,400,000	$ 2,600,000	$ 1,300,000	$ 9,500,000
Restricted Stock [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Number Of Executive Officers						2										2
Restricted Stock Award, Forfeitures | $																$ 433,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in Shares)											10,936					69,442		69,247		19,480
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures (in Shares)																52,428
Restricted Stock [Member] | Minimum [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																1 year
Restricted Stock [Member] | Maximum [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																3 years
Executive Officer [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in Shares)													306,122	191,489
Stock Issued During Period, Value, Restricted Stock Award, Gross | $													$ 4,500,000	$ 4,500,000
Number Of Executive Officers						2							2	2		2
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period														3 years
Executive Officer [Member] | Restricted Stock [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in Shares)											70,421
Stock Issued During Period, Value, Restricted Stock Award, Gross | $											$ 700,000
Number Of Executive Officers											2
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period											4 years
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in Shares)																16,886		19,098		4,235
Restricted Stock Award, Forfeitures | $																$ 173,526		$ 273,000		$ 98,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures (in Shares)																16,886
Non Employee Director [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in Shares)													32,823	24,948
Stock Issued During Period, Value, Restricted Stock Award, Gross | $													$ 500,000	$ 600,000
Number Of Non Employee Directors													6	6
Non Employee Director [Member] | Restricted Stock [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in Shares)				5,470
Fair Value, Recurring [Member] | Redeemable Preferred Stock [Member] | Fair Value, Inputs, Level 3 [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | $			$ 4,900,000			$ 8,100,000										$ 8,100,000		5,200,000
Redeemable Preferred Stock [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Dividends | $																0		$ 0
Dividends Payable | $						$ 1,700,000										$ 1,700,000

[1] After giving effect to a 1 for 10 reverse stock split effective July 9, 2020.