Common Stock and Preferred Stock (Details)					1 Months Ended						3 Months Ended							9 Months Ended
		Jul. 09, 2020 $ / shares	Aug. 09, 2019 USD ($) $ / shares shares	Jan. 01, 2019 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	Jun. 30, 2014 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($) shares		Mar. 31, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($) shares	Mar. 31, 2019 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 $ / shares 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
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (in Shares) | shares								16,417
Stock Issued During Period, Shares, New Issues (in Shares) | shares			585,300
Stock Issued During Period, Value, New Issues			$ 4,200,000												$ 4,209,000
Paid-in-Kind Interest																		$ 3,370,000	$ 624,000
Stock Issued During Period, Value, Conversion of Convertible Securities											$ 1,260,000	$ 9,473,000	[1]
Dividends																		$ 0	0
Temporary Equity, Shares Issued (in Shares) | 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) | 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											$ 316,000				180,000			$ 935,000	180,000
Temporary Equity, Number Of Shares Outstanding In Which One Director May Be Elected (in Shares) | shares			50,000
Temporary Equity, Voting Percentage Required To Change Number Of Directors			80.00%
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]
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	$ 7,100,000
Paid-in-Kind Interest					$ 27,288	$ 200,000
Common Stock [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Stock Repurchased During Period, Shares (in Shares) | shares										311,284
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, Value, New Issues															1,000
Stock Issued During Period, Value, Conversion of Convertible Securities	[1]											1,000
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) | shares					177,085	710,100
Stock Issued During Period, Value, Conversion of Convertible Securities					$ 1,300,000	$ 9,500,000
Restricted Stock [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (in Shares) | shares							10,936											69,440
Restricted Stock Award, Forfeitures												$ 163,000		$ 270,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures (in Shares) | shares												26,214		26,214
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																		5 years
Executive Officer [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in Shares) | shares									306,122
Stock Issued During Period, Value, Restricted Stock Award, Gross									$ 4,500,000
Number Of Executive Officers									2					2			2
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) | shares							70,421
Stock Issued During Period, Value, Restricted Stock Award, Gross							$ 700,000
Number Of Executive Officers							2
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in Shares) | shares														16,640		2,428	16,670
Restricted Stock Award, Forfeitures														$ 172,000		$ 25,000	$ 249,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period							4 years
Non Employee Director [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross (in Shares) | shares									32,823
Stock Issued During Period, Value, Restricted Stock Award, Gross									$ 500,000
Number Of Non Employee Directors									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) | shares				5,470
Employee [Member] | Restricted Stock [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited (in Shares) | shares												246
Restricted Stock Award, Forfeitures												$ 1,526
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								5,900,000				$ 4,900,000			$ 5,900,000	4,900,000
Redeemable Preferred Stock [Member]
Common Stock and Preferred Stock (Details) [Line Items]
Dividends																		0	$ 0
Dividends Payable											$ 1,400,000							$ 1,400,000

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