Debt (Details)										1 Months Ended									3 Months Ended					6 Months Ended	9 Months Ended		12 Months Ended
		Oct. 16, 2020 USD ($)	Sep. 30, 2020 USD ($) $ / shares shares	Jul. 09, 2020 $ / shares shares	Jun. 12, 2020 USD ($)	Aug. 09, 2019 USD ($)	Nov. 01, 2018 USD ($) $ / shares	Jul. 26, 2018 USD ($)	Nov. 07, 2017 USD ($)	Aug. 31, 2020 USD ($) shares	Jun. 30, 2020 USD ($) shares	Aug. 31, 2019 USD ($) $ / shares	Aug. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Aug. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jun. 30, 2014 USD ($) $ / shares	Jul. 31, 2013 USD ($) $ / shares	Sep. 30, 2020 USD ($) $ / shares shares	Jun. 30, 2020 USD ($)		Sep. 30, 2019 USD ($)	Jun. 30, 2017 USD ($) shares	Jun. 30, 2017 USD ($) shares	Sep. 30, 2020 USD ($) $ / shares shares	Sep. 30, 2019 USD ($)	Dec. 31, 2016 USD ($)	Aug. 09, 2020 $ / shares	Jun. 29, 2020 shares	Dec. 31, 2019 USD ($) $ / shares shares	Feb. 09, 2019 $ / shares	Aug. 01, 2018 USD ($)	Jun. 14, 2018 USD ($)	Mar. 31, 2017 USD ($)
Debt (Details) [Line Items]
Value of debt outstanding			$ 38,401,000																$ 38,401,000						$ 38,401,000					$ 52,658,000
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					$ 0.001
Common Stock, Shares, Outstanding (in Shares) | shares			4,416,663	4,239,578															4,416,663						4,416,663				42,395,782	3,521,037
Gain (Loss) on Extinguishment of Debt																			$ 0			$ (13,205,000)			$ 0	$ (13,205,000)
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]
Adjustments to Additional Paid in Capital, Other																						2,000			1,300,000
Liabilities, Fair Value Adjustment																			2,809,000			(463,000)			2,757,000	(2,992,000)
Amortization of Debt Discount (Premium)																									2,093,000	393,000
Debt Issuance Costs, Gross																																	$ 1,300,000
3.25% Convertible Senior Notes Due 2023 [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage															3.25%															3.25%
Value of debt outstanding			$ 38,400,000																$ 38,400,000						$ 38,400,000					$ 50,800,000
Debt Instrument, Face Amount								$ 8,000,000.0
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares				$ 10.00								$ 1.00																$ 5.647			$ 1.00
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares										177,085	710,100
Debt Instrument, Redemption Price, Percentage												105.00%
Interest rate if paid cash															3.25%
Interest rate if paid stock															5.00%
Interest rate if paid in-kind															2.75%
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger												30.00%
Debt Instrument, Convertible, Threshold Percentage of Market Price Trigger												150.00%
Equity Method Investment, Ownership Percentage												49.00%
Debt Conversion, Converted Instrument, Amount										$ 1,000,000.0	$ 7,100,000
Paid-in-Kind Interest										27,288	200,000
Stock Issued During Period, Value, Conversion of Convertible Securities											9,500,000
4.25% Convertible Senior Notes (due 2018) [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage															4.25%			4.25%
Debt Instrument, Face Amount								$ 8,000,000.0							$ 21,600,000			$ 100,000,000.0
Debt Instrument, Convertible, Conversion Ratio																		114.3674
Debt Instrument, Convertible, Incremental Value of Principal Converted																		$ 1,000
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares																		$ 8.74
Debt Instrument, Repurchase Amount																							$ 12,000,000.0	$ 12,000,000.0			$ 6,100,000							$ 39,100,000
Write off of Deferred Debt Issuance Cost																							100,000				$ 100,000
Repayments of Convertible Debt																								$ 24,100,000
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares																								290,000
Gain (Loss) on Extinguishment of Debt																							100,000
Interest rate if paid cash								3.25%
Interest rate if paid stock								5.00%
Interest rate if paid in-kind								2.75%
Debt Conversion, Converted Instrument, Amount														$ 8,000,000.0
3.25% Convertible Senior Notes (due 2020) [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage								3.25%							3.25%
Debt Instrument, Face Amount								$ 8,000,000.0
Debt Instrument, Convertible, Conversion Ratio								322.2688
Debt Instrument, Redemption Price, Percentage							105.00%
Debt Conversion, Converted Instrument, Amount										1,000,000.0	7,100,000
Paid-in-Kind Interest										$ 27,288	$ 200,000
4.875% Convertible Senior Notes Due 2020 [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			4.875%														4.875%		4.875%						4.875%					4.875%
Value of debt outstanding												$ 111,100,000
Debt Instrument, Face Amount												113,000,000.0					$ 115,000,000.0
Debt Instrument, Convertible, Conversion Ratio																	103.7613
Debt Instrument, Convertible, Incremental Value of Principal Converted																	$ 1,000
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares																	$ 9.64
Debt Instrument, Repurchase Amount																$ 2,000,000.0
Write off of Deferred Debt Issuance Cost						$ 700,000										100,000
Gain (Loss) on Extinguishment of Debt						(2,400,000)										$ 100,000
Debt Instrument, Original Amount Of Debt Refinanced												103,800,000
Debt Instrument, Amount Of Accrued Interest Refinanced												1,000,000.0
Debt Instrument, Amount Of Debt Exchanged Into A New Instrument												$ 7,300,000
Senior Notes			$ 1,900,000																$ 1,900,000						$ 1,900,000
Convertible Debt, Fair Value Disclosures																														$ 1,700,000
Senior Notes [Member]
Debt (Details) [Line Items]
Amortization of Debt Discount (Premium)																						$ 100,000				$ 500,000
Paycheck Protection Program Loan [Member] | Unsecured Debt [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					1.00%
Debt Instrument, Face Amount					$ 6,200,000
Long-term Debt, Current Maturities			2,500,000																2,500,000						2,500,000
Monthly payments					$ 261,275
Long-term Debt, Excluding Current Maturities			3,700,000																3,700,000						3,700,000
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member]
Debt (Details) [Line Items]
Common Stock, Par or Stated Value Per Share (in Dollars per share) | $ / shares												$ 0.001
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member] | 3.25% Convertible Senior Notes Due 2023 [Member]
Debt (Details) [Line Items]
Debt Instrument, Face Amount												$ 8,000,000.0			$ 21,600,000
Debt Instrument, Principal Amount, Redeemed																																$ 13,200,000
Paid-in-Kind Interest																			200,000						700,000
Oasis Management And Oasis Investments ll Master Fund Ltd. [Member] | 3.25% Convertible Senior Notes (due 2020) [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage															3.25%
Debt Instrument, Face Amount															$ 21,600,000
Debt Instrument, Convertible, Conversion Ratio							393.7008								328.0302
Debt Instrument, Convertible, Incremental Value of Principal Converted							$ 1,000						$ 1,000
Debt Instrument, Convertible, Conversion Price (in Dollars per share) | $ / shares							$ 2.54
Gain (Loss) on Extinguishment of Debt								$ (500,000)	$ (600,000)			$ (10,400,000)
Liabilities, Fair Value Adjustment																			2,800,000						2,800,000
Common Stock [Member]
Debt (Details) [Line Items]
Stock Issued During Period, Value, Conversion of Convertible Securities	[1]																			$ 1,000
Common Stock [Member] | 4.25% Convertible Senior Notes (due 2018) [Member]
Debt (Details) [Line Items]
Debt Instrument, Repurchase Amount																							$ 11,600,000	$ 11,600,000
Debt Conversion, Converted Instrument, Shares Issued (in Shares) | shares																							11,240
Common Stock [Member] | 3.25% Convertible Senior Notes (due 2020) [Member]
Debt (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
Secured Debt [Member] | New Term Loan Agreement [Member]
Debt (Details) [Line Items]
Debt Instrument, Interest Rate, Stated Percentage												10.50%
Value of debt outstanding	[2]		134,801,000																134,801,000						134,801,000					134,801,000
Interest Payable			4,000,000.0																4,000,000.0						4,000,000.0					1,300,000
Interest rate if paid cash												8.00%
Interest rate if paid in-kind												2.50%
Paid-in-Kind Interest																									4,000,000.0
Amortization of Debt Discount (Premium)																			700,000						2,100,000
Line of Credit Facility, Maximum Borrowing Capacity												$ 134,800,000
Debt Instrument, Covenant Compliance, EBITDA Requirment			34,000,000.0
Debt Instrument, Covenant Compliance, Minimum Liquidity			10,000,000.0
Long-term Debt, Current Maturities			20,000,000.0																20,000,000.0						20,000,000.0
Convertible Debt			138,800,000																138,800,000						138,800,000
Debt Issuance Costs, Gross						3,800,000
Amortization of Debt Issuance Costs																			300,000						800,000
Debt Instrument, Unamortized Discount						$ 10,100,000
Long-term Debt, Fair Value			131,000,000.0																131,000,000.0						131,000,000.0					123,400,000
Reported Value Measurement [Member] | 3.25% Convertible Senior Notes Due 2023 [Member]
Debt (Details) [Line Items]
Value of debt outstanding			29,600,000																29,600,000						29,600,000					37,600,000
Interest Payable			$ 1,000,000.0																$ 1,000,000.0						$ 1,000,000.0					$ 400,000
Forecast [Member] | Secured Debt [Member] | New Term Loan Agreement [Member]
Debt (Details) [Line Items]
Debt Instrument, Covenant Compliance, EBITDA Requirment		$ 25,000,000.0
Debt, Pre-payment		15,000,000.0
Forecast [Member] | Secured Debt [Member] | Payment No Later than Third Quarter 2021 [Member] | New Term Loan Agreement [Member]
Debt (Details) [Line Items]
Debt, Pre-payment		$ 5,000,000.0

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

[2] The amount presented excludes accrued, but unpaid, payment-in-kind interest of $4.0 million and $1.3 million as of September 30, 2020 and December 31, 2019, respectively.